If you can't find a good indy, then I'd go and talk to a "Midas" or a shop that can do tranny work and "interview" them about working on your tranny. What do they know about BMW's and ask them..... "to show where the dip stick for the tranny is". Keep in mind we don't have one. If he points to the oil dip stick then advise him to get a manual and read up on BMW tranny's and you'll be back. When he can answer the question with some confidence.