Ok. I will try and find out why I'm reading 0V there.
Slightly more alarming - I had not checked if there were any difference in readings depending on whether the robot/control was in fault mode or not.
I had been checking all of these voltages in fault mode (Turn TP on/off quickly w/o the deadman). So I checked the same points with out faulting the robot and the voltages are crazy high. 100+V high. Something is very wrong.