Fooled around with the sunroof motor etc. in the trunk. Removed the bolts securing it to the body and flipped it around - manually turned/fooled around the plastic gears on the lower half - also lubricated everything. Put back but now the roof wont open or shut electrically - when I activate the switch I can hear the motor working. The cable is OK because I can open and shut the roof manually by the bolt on the motor assembly. What can the problem be?