Door Panels on '96 Impala - I just went through the whole interior fixing everything I could find, new leather upholstery etc., getting it to 100% correct condition, and it's turned out well. Only one problem - the door panels make noise - creaking and squeaking, whenever you pull on them or even just riding along. I'd already fixed all the plastic fasteners and the supports they plug into, all screws in place, just as good as factory, solid as it gets. And it makes noise. This sounds like something an old mechanic might know about, tricks of the trade sort of thing. So what's the best way to fix this?