The motor/actuator is actually two tiny electric motors linked by gears and linkage to a rotating plastic ball attached to the mirror support plate. A short in there would be problematic to fix but the good news is it's more likely to be the switch. I can fix bad switch's and have disassembled the actuator motor successfully. Try to verify the switch is good before going further. If you need a Act/Mtr I can help you there as well. I had a pic for you of the assembly torn apart but can't upload it for some reason.
Rob