Pull off the door panel on the side with the problem. Get a schematic for the window circuit. I know the haynes manuals have them. Check all connections. I think it is probaly the motor. The brushes on it may be worn. Anyways, what circuit board are you talking about? Basic parts of the circuit are switch, regulator, and motor. Try tapping the area around the motor when putting the window up and down. Just do a little troubleshooting.
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