Willrev,
Did you take the car back to the repair facility and give them a chance to correct any mistake they may have made? That would have been the proper way to handle the situation. Maybe an employee did the work and the owner doesn't know. I also have a hard time understanding how the teeth on the regulator were out of synch with the teeth on the motor. They match or the window doesn't go up and down. Perhaps your window regulator is badly twisted and should have been replaced. MB power window motors have a lot of torque and either strip out the last few teeth on the regulator in the up position or twist the regulator so badly that it can't function.

Peter

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