Has anybody thought about changing the differential bolt as a preventative measure? If so, what part number would you use? Perhaps we could source the solid M3 GTS bolt, in that case?
OP, I'm very glad that the dealership was able to fight for your repair to be covered under warranty. Having just read through this thread, it's amazing the lack of empathy some have for other people's misfortune. I'd be mad as hell if they tried to pull this over on me. Funny how all the people who made repeated posts telling you to give up and file an insurance claim are now suddenly all quiet.
-phil | 2009 E92 M3 - AW/black/CF - 6MT and a silly grin every time i drive...