Good morning, unfortunately I did not find anything with the SuFu, so unfortunately I have to open an extra post again. The window lifter of the passenger door does not work properly anymore, it goes down a little bit and from then on it only ratters. I assume that some gear is defective or that there are some teeth broken, because the engine is still spinning. I have now removed the door panel already, only I come to the upper part, where the handle to pull the door d How is the upper part fixed? Glued, clipped, screwed? I’m also afraid to break something, because interior parts are not so easy to get. Thanks in advance for every tip!