Do I trust the dealer mechanic?

Maintenance/Repairs
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2

Six weeks of the problem being solved is long enough for it to be a coincidental failure, and if it weren’t leaking at that seal when they had it, they could not foretell it. The only thing I can think of that they may have done to cause such a problem is overfilling the transmission. Check the fluid level periodically, especially after you get the car back from having the transmission worked on. Just because it should be right doesn’t necessarily mean it will be right. If you are uncomfortable with your dealer service department, find a good independent shop to patronize.