so this morning had another look at the print and made an attempt to solder the resistors back. didn't make any difference but one got so brittle it broke off. Will get them replaced next week. Acc to my measurements they are both 17-18 ohms at 2Watt (the blueish one is 15 ohms at 2 Watts (its still visible on that one. on the white ones it has burned of... (if someone has other/more detailed info on these, please share)

I assume it's part of the problem. Wether it is a reason or consequence of something else is not yet clear.

My drive print has a sticker on the back saying " QA-tested 03-15-13"
considering it's a 2000 forklift, this one has already been replaced before...