The driver window has been working off and on for the last few weeks but now it has completely stopped working. the motor runs but nothing happens. The window will drop slightly and has to be pulled back up by hand. I have taken the trim off to check it out but cannot see where the problem is. I would suspect that the drive on the motor has broken but cant confirm because I can't see where the motor drives the window mechanism. Anybody have any experience/advice re this problem?

Don