Well, I don't know if this may help you or not, but tonite when I changed out my driver's side door mirror and I took the door panel off (which you don't have to take off) and some Styrofoam thingy fell out. I looked at it and it seems to fit somewhere near the doorknob area. Maybe that thing popped in the way (it is loose and not held together by nothing other than the door panel). Hope this helps.