my passenger window does not roll down all the way, it goes down and stops with about 1.5-2 in left, ive already removed the door panel and there was nothing blocking it, i think the track my be worn on the bottom cuz when the window stops the handle keeps spinning(manual windows) and the window needs to be pulled up by hand so that the handle can roll it up again. my question is what do u think it could be and if it is the track how difficult would it be to replace it? TIA