IHS sensing error, service bulletin says accumove repair needed

in the middle of job ohmic sensing stopped working. followed the bulletin and checked wires/voltages/connections to the point it said the accumove may need to be repaired. i jumped ground to pin 4 on vfc and vmc didnt register a sense and the voltage measures 12.

anyone run into this before? im right in the middle of my busiest 2mo of the year and this will crush me so im trying to get ahead of support. Any ideas would be great.

torchmate 4400 accumove 2