in need of BMW mechanic

i have a strange request, due to a current lawsuit i'm in need of a shop or mechanic willing to replace oem for oem bmw parts so as rule out assumed problems. i won't go into extreme detail. if anyone knows of a good reliable shop please let me know or a good mechanic who'd be willing to do this. i could go to the dealer however the cost is gonna kill me. long story.

thanks,

oh and the location the car is in is Nor Cal. so in this area would make it easier.