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There is a switch attached to the emergency brake mechanism that only allows the top to go up or down when the emergency brake is set. It is not that difficult to remove the drive motor to confirm whether or not it is working. Three nuts hold the motor bracket and two clips hold the drive cables. One on each side and the wiring harness.
If you are sure it is not the motor the e brake switch would be easy enough to test next. I am assuming from your post that the motor is not turning at all.
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