Why didn't you bring it back to the dealer who did the tranny? If you bought me a car some other dealer worked on, I would be hesitant to work on it as well. Unless you have a warranty on the tranny no one is going to work on it for free. I'm hoping a BMW dealer did it. If so, they should be the people looking at it.

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'03 Carbon Black M5
'04 Silver X5 4.4
'04 MB SL500