My window went down then click, click, click, click, click. Would not go back up after that. I removed door panel to inspect. Plastic wheels are in tip top shape and rolling perfect. I removed assembly and noticed the gears had separated somehow. They dont seem to be bent or broken though. I reassembled and window goes up and down perfectly till it comes to the bottom of the door. It seems that the window is going down too far and causing the gears to seperate. too wierd. please help! Is there some kind of sensor that tells the window to stop going down? any info is appreciated!