On the way home (ironically, from the body shop) the front passenger window just dropped halfway down. No reaction from buttons other than crunching noises, both up and down. The window itself can be lifted by hand. What I wonder is, is that a routine window regulator malfunction (like this: http://tinyurl.com/mxvjg7 - part #51338252394 @ http://www.realoem.com/bmw/showparts.do?model=DN53&mospid=47588&btnr=51_2250&hg=51&fg=10) or something more insidious than that? Still have a couple of hours before I will get to disassembling the door, all clues are welcome.