sweet! sounds like you got a good deal. Does the a/c work? sunroof? just curious. Anyway, about your window. My best guess is the switch itself is going bad. I've seen this countless times on my 300SD, mostly with the seat switches and sunroof switch. I have had luck taking the switch apart and cleaning it, although it normally only works that way for a couple months then i get to clean it out again. MB must have used some sort of special lube, anyone know what it is? you could try jumping the switch using aligator clips and see what happens. Hope this helps
Ryan