Good Morning from Germany: Since delivery of My Superamerica the driver's side window has gone out of adjustment twice. The dealer about 120 miles away( two taxi rides and a train ride)

-has fixed it twice. This last time the adjustment seemed fine but after no more then a week, the window stopped half way down during the top opening sequence and I heard a noise. When I completed the closing sequence with the dash mounted control and reraised the window it no longer fit against the upper portion of the window seal and there was quite a space and now a severe air leak and noise when the window is closed. Do you think I can tackle the adjustment myself? I am not sure how to get the door fascia off without causing any damage. There is a local body shop here in Baumholder which has a good reputation. Do you think they would be able to do such an adjustment? Thank you for any advice. Oscar