well sunroof will go down but wont go back. i was able to trouble shoot it to the motor. i took it apart and im getting about 12.5 and -12.5 across the brushes when i hit the sunroof switch. there was a large build up of brush dust that i cleared up and i thought was the problem. i put it back together and still no go in the foward direction. the windings looked fine no sign of burns or melted insulation. does anyone know what could be wrong with this motor.