Finally got my rear window working and went to roll it down and it seems stuck in the fully rolled up position. I can hear the motor engage when switched from the dash or tailgate but no window movement. I originally fixed this problem when I found the inside tailgate panel was bent in and binding against the bottom window rail. Pulled it out again this morning and no change. Motor gears are not grinding at all; it just won’t move. Would appreciate any ideas on what to try. Thanks