
Try removing and cleaning the little connectors under the up/down buttons. They're usually in a silicone sheet with each connector just below each button. Worth a try. Unless you were told it's for sure the motor.
Two different ways...
(Depending on your car, of course)
youtube.com/watch?v=h-YEYt…
youtube.com/watch?v=Ly-WQO…

YouTube

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