This is what's known as a Master 4 module in a LHM550 Liebherr harbour crane.
Earlier this week it was hit by lightning causing the module to output a combined 8 volts out on the can line 3 circuit.
The rest of the module works fine, all functions work except anything related to can line 3.
Can line 3 output is the 2nd white plug port on the top left of the photo.
I know it's probably a long shot but does anyone have any familiarity with these kinds of things?
I have added a couple more photos in the comments.
I couldn't visually see any sort of obvious fail point.
I have had a lot of experience with things like this and I know you don't want to hear it and it's a bummer, but lightning damage is always fatal. It damages so many parts, it becomes a game of whac-a-mole. And even if you replace enough components that it starts working again, it won't ever work right. Lightning damages components in ways where it sort of seems to work, but then it misbehaves in strange ways. Either the thing is very easily repairable because it was protected by something designed to fail and be easily replaced, or it's a lost cause. This seems like the lost cause kind of situation, I would suggest replacing the entire unit.
Yeah already done that and a second module at a cost of 17k for the two.
Was just an exercise in curiosity really since they get hit once or twice a year