diff --git a/functions/openapi/operation_4x_response.go b/functions/openapi/operation_4x_response.go
index eb1a010b..d5113808 100644
--- a/functions/openapi/operation_4x_response.go
+++ b/functions/openapi/operation_4x_response.go
@@ -4,10 +4,9 @@
 package openapi
 
 import (
-	"fmt"
 	"github.com/daveshanley/vacuum/model"
 	vacuumUtils "github.com/daveshanley/vacuum/utils"
-	"github.com/pb33f/libopenapi/utils"
+	"github.com/pb33f/doctor/model/high/base"
 	"gopkg.in/yaml.v3"
 	"strconv"
 )
@@ -27,52 +26,45 @@ func (or Operation4xResponse) GetCategory() string {
 }
 
 // RunRule will execute the Operation4xResponse rule, based on supplied context and a supplied []*yaml.Node slice.
-func (or Operation4xResponse) RunRule(nodes []*yaml.Node, context model.RuleFunctionContext) []model.RuleFunctionResult {
-
-	if len(nodes) <= 0 {
-		return nil
-	}
-
+func (or Operation4xResponse) RunRule(_ []*yaml.Node, context model.RuleFunctionContext) []model.RuleFunctionResult {
 	var results []model.RuleFunctionResult
 
-	if context.Index.GetPathsNode() == nil {
+	if context.DrDocument == nil {
 		return results
 	}
-	ops := context.Index.GetPathsNode().Content
 
-	var opPath, opMethod string
-	for i, op := range ops {
-		if i%2 == 0 {
-			opPath = op.Value
-			continue
-		}
-		for m, method := range op.Content {
-			if m%2 == 0 {
-				opMethod = method.Value
-				continue
-			}
-			basePath := fmt.Sprintf("$.paths.%s.%s", opPath, opMethod)
-			_, responsesNode := utils.FindKeyNode("responses", method.Content)
+	for pathPairs := context.DrDocument.V3Document.Paths.PathItems.First(); pathPairs != nil; pathPairs = pathPairs.Next() {
+		pathItem := pathPairs.Value()
 
-			if responsesNode != nil {
+		// extract operations
+		for methodPairs := pathItem.GetOperations().First(); methodPairs != nil; methodPairs = methodPairs.Next() {
+			operation := methodPairs.Value()
+
+			// check if operation has a 4xx response
+			if operation.Value.Responses != nil {
 				seen := false
-				for k, response := range responsesNode.Content {
-					if k%2 != 0 {
-						continue
-					}
-					responseCode, _ := strconv.Atoi(response.Value)
-					if responseCode >= 400 && responseCode <= 499 {
-						seen = true
+				for codePairs := operation.Responses.Codes.First(); codePairs != nil; codePairs = codePairs.Next() {
+					code := codePairs.Key()
+
+					// convert code to int
+					codeVal, er := strconv.Atoi(code)
+					if er == nil {
+						if codeVal >= 400 && codeVal < 500 {
+							seen = true
+							break
+						}
 					}
 				}
 				if !seen {
-					results = append(results, model.RuleFunctionResult{
+					res := model.RuleFunctionResult{
 						Message:   "operation must define at least one 4xx error response",
-						StartNode: method,
-						EndNode:   vacuumUtils.BuildEndNode(method),
-						Path:      basePath,
+						StartNode: operation.Responses.KeyNode,
+						EndNode:   vacuumUtils.BuildEndNode(operation.Responses.KeyNode),
+						Path:      operation.Responses.GenerateJSONPath(),
 						Rule:      context.Rule,
-					})
+					}
+					results = append(results, res)
+					operation.Responses.AddRuleFunctionResult(base.ConvertRuleResult(&res))
 				}
 			}
 		}
diff --git a/functions/openapi/operation_4x_response_test.go b/functions/openapi/operation_4x_response_test.go
index a4ee2dd7..27ce6d5b 100644
--- a/functions/openapi/operation_4x_response_test.go
+++ b/functions/openapi/operation_4x_response_test.go
@@ -1,11 +1,11 @@
 package openapi
 
 import (
+	"fmt"
 	"github.com/daveshanley/vacuum/model"
-	"github.com/pb33f/libopenapi/index"
-	"github.com/pb33f/libopenapi/utils"
+	drModel "github.com/pb33f/doctor/model"
+	"github.com/pb33f/libopenapi"
 	"github.com/stretchr/testify/assert"
-	"gopkg.in/yaml.v3"
 	"os"
 	"testing"
 )
@@ -25,17 +25,25 @@ func TestOperation4xResponse_RunRule_Success(t *testing.T) {
 
 	sampleYaml, _ := os.ReadFile("../../model/test_files/burgershop.openapi.yaml")
 
-	var rootNode yaml.Node
-	mErr := yaml.Unmarshal(sampleYaml, &rootNode)
-	assert.NoError(t, mErr)
-	nodes, _ := utils.FindNodes(sampleYaml, "$")
-	rule := buildOpenApiTestRuleAction(GetAllOperationsJSONPath(), "xor", "responses", nil)
+	document, err := libopenapi.NewDocument(sampleYaml)
+	if err != nil {
+		panic(fmt.Sprintf("cannot create new document: %e", err))
+	}
+
+	m, _ := document.BuildV3Model()
+	path := "$"
+
+	drDocument := drModel.NewDrDocument(m)
+
+	rule := buildOpenApiTestRuleAction(path, "responses", "", nil)
 	ctx := buildOpenApiTestContext(model.CastToRuleAction(rule.Then), nil)
-	config := index.CreateOpenAPIIndexConfig()
-	ctx.Index = index.NewSpecIndexWithConfig(&rootNode, config)
+
+	ctx.Document = document
+	ctx.DrDocument = drDocument
+	ctx.Rule = &rule
 
 	def := Operation4xResponse{}
-	res := def.RunRule(nodes, ctx)
+	res := def.RunRule(nil, ctx)
 
 	assert.Len(t, res, 0)
 }
@@ -44,17 +52,25 @@ func TestOperation4xResponse_RunRule_ExitEarly(t *testing.T) {
 
 	sampleYaml := []byte("hi: there")
 
-	var rootNode yaml.Node
-	mErr := yaml.Unmarshal(sampleYaml, &rootNode)
-	assert.NoError(t, mErr)
-	nodes, _ := utils.FindNodes(sampleYaml, "$")
-	rule := buildOpenApiTestRuleAction(GetAllOperationsJSONPath(), "xor", "responses", nil)
+	document, err := libopenapi.NewDocument(sampleYaml)
+	if err != nil {
+		panic(fmt.Sprintf("cannot create new document: %e", err))
+	}
+
+	m, _ := document.BuildV3Model()
+	path := "$"
+
+	drDocument := drModel.NewDrDocument(m)
+
+	rule := buildOpenApiTestRuleAction(path, "responses", "", nil)
 	ctx := buildOpenApiTestContext(model.CastToRuleAction(rule.Then), nil)
-	config := index.CreateOpenAPIIndexConfig()
-	ctx.Index = index.NewSpecIndexWithConfig(&rootNode, config)
+
+	ctx.Document = document
+	ctx.DrDocument = drDocument
+	ctx.Rule = &rule
 
 	def := Operation4xResponse{}
-	res := def.RunRule(nodes, ctx)
+	res := def.RunRule(nil, ctx)
 
 	assert.Len(t, res, 0)
 }
@@ -63,17 +79,25 @@ func TestOperation4xResponse_RunRule_Fail(t *testing.T) {
 
 	sampleYaml, _ := os.ReadFile("../../model/test_files/stripe.yaml")
 
-	var rootNode yaml.Node
-	mErr := yaml.Unmarshal(sampleYaml, &rootNode)
-	assert.NoError(t, mErr)
-	nodes, _ := utils.FindNodes(sampleYaml, "$")
-	rule := buildOpenApiTestRuleAction(GetAllOperationsJSONPath(), "xor", "responses", nil)
+	document, err := libopenapi.NewDocument(sampleYaml)
+	if err != nil {
+		panic(fmt.Sprintf("cannot create new document: %e", err))
+	}
+
+	m, _ := document.BuildV3Model()
+	path := "$"
+
+	drDocument := drModel.NewDrDocument(m)
+
+	rule := buildOpenApiTestRuleAction(path, "responses", "", nil)
 	ctx := buildOpenApiTestContext(model.CastToRuleAction(rule.Then), nil)
-	config := index.CreateOpenAPIIndexConfig()
-	ctx.Index = index.NewSpecIndexWithConfig(&rootNode, config)
+
+	ctx.Document = document
+	ctx.DrDocument = drDocument
+	ctx.Rule = &rule
 
 	def := Operation4xResponse{}
-	res := def.RunRule(nodes, ctx)
+	res := def.RunRule(nil, ctx)
 
 	assert.Len(t, res, 402)
 }