I got lucky enough to get a p28 that had a chip installed no socket. So well I went to remove the old chip and ripped a trace. Its still there and see where it goes etc but I do I actually set it back in place on the board.

 

 

I don't know how many PCB layers these ECUs are, but if you damaged a via and you don't know what else connects to it with more than 2 layers, then it's tough.

Otherwise, just use an x-acto knife and cut the loose part away, scrape the soldermask off both ends of the broken trace and bypass it with a wire.
If the trace is not actually broken, just loose from the board, you can stick it back with superglue. Just don't expect superglue to hold the soldering heat.

 

ive jumpered traces with wire before. worked fine

 

I had to jumper 3 on the first PM6 I chipped. I sold it a while back and its been fine ever since.

 

i've actually had an ecu where the previous person use a wire to fix it.