i had a machine do this about a month ago
both controls were fried and had similar codes in both boxes (clark 3 wheeler with individual motor controls and contactor pump)

remove all the cables and the plug
check for continuity between the A terminals and the heatsink
no continuity should exist

then do the same for the field, B+, and NEG terminals to the heatsink
again no continuity should exist

then check for continuity between all the heavy terminals (b+, A1, A2, F1, F2, and NEG)
the only two that should have continuity is B+ to A1 the rest are isolated by the internal transistors with the power off and all cables removed

if you take that cover off youll most likely smell that it burnt up before you see it lol (i know i did)

if not check the motors for shorts

this one has 2 different sized GE boxes?
it would help to have the beginning part of the serial number or the complete model number (or both lol)