slic3r calls for multiple M104 and M140 commands. I am using different layer heights, and I suspect that that each layer height change is calling for a temperature change. Unfortunately on a ToM, I suspect that calling
M140 S100 ; set bed temperature
M140 S100 T0; set bed temperature
triggers a bug in the Extruder Controller that turns off the heated bed but continues to report the temperature setpoint!
gcode is here:
credit goes to Dan Newman for reading the gcode and find these extraneous commands.
No longer a concern of mine, I stopped using slic3r awhile ago