I've never seen the power window set up in a 4, but I've had plenty of others to bits. If the motor is working but the window doesn't wind up it's usually caused by something that's worked loose. Check the bolts that secure the motor and mechanism. Tighten them after making sure that the winder gears mesh fully.
I very much doubt that the car would be warrantied unless a special, transferable guarantee is in place.
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