How do I fix a malfunctioning power window in my Audi A4?

My driver's side window is stuck and won't roll up or down, but the rest of my windows are working fine. How can I troubleshoot and repair this issue?

First, check the power window fuse and replace it if needed. If that doesn't solve the problem, it could be a faulty window motor or switch. Try using a multimeter to check for proper voltage at the motor. If there is no voltage, the switch may need to be replaced.

It could also be a problem with the window regulator, which controls the movement of the window. Inspect the regulator for any damage or wear and tear, and replace it if necessary. Don't forget to lubricate the track and rollers to ensure smooth operation.