[EC900]

Isn’t there an override hex screw for a factory crank tool to operate seats manually in these situations, same tool as the later style sunroof crank? It’s probably a mechanical failure with gearing, (missing tooth, coin in the track, etc.) than electrical.
Second the tap the motor routine. My Bmw seat got stuck full forward, no click or motor sound. Tap a few times freed up whatever was stuck.