BC-Wackler-> cold soldering point, but which one?

Hey, guys.

I've been allowed to cruise around with my V8 since Saturday. He survived the six months of service almost without harm. Only the BC dances out of line. It has already announced itself, but now he seems completely crazy. The displays appear and disappear arbitrarily at irregular intervals, and the display consumes liters from start stops at 0.0.
The radio station display disappears after some time. Sometimes radio helps out and again, but usually it stays away for the rest of the ride and comes back at the next start when the thickness is cold.
There seem to be cold soldering points on the board... But which one?
Has anyone ever done this before and can tell me the soldering points that are in question, or at least limit the range?
Or is it the BC itself and you are looking for a good used one?

Thank you for every tip and hint.