That's the frustrating part, took the panel off, pulled the motor, was ready to swap it,but it runs fine off the frame, window slides up and down track fine by hand with motor out, reassemble every thing, works fine, think I have the problem fixed, then it hits the bottom of it's travel and stops again and won't go back up. Take every thing apart again, same story. It's got to be something in whatever makes the motor realize it's hit the end of the window travel....