plans from Kai Robinsons Recreation of the Macintosh Classic logic board https://github.com/kr239/Macintosh-Classic-Reloaded
because there is no boardview file of the 820-0390-03 board, i created a photoshop file with all the lanes in the region of the battery highlighted in singe layers (front & back) for measuring continuity and to identify broken connections
use photoshop or a compatible program to activate the layers/pins you want to trace, dont forget to also select the front or back layer of the trace (o .. front, u .. back)
photoshop file (zipped) -> https://github.com/biho1/Macintosh-Classic-Reloaded-Traces/blob/main/logicboard-traces.psd.zip
sample of UB5 bottom pin 3 connections
front and back layer activated, the connection to the ROM and to the pad on the bottom right are on the back side of the board the rest is on the front
if you plan to solder, please check twice and use this plans at own risk