W124 Rear window gets stuck and stops early

[lpozzo]

I have a 1992 300e (2.6L) and the rear left window seems not to be working well. I had opened the window normally and then upon closing the window completely, I heard a snapping noise.

I then could no longer open the window up and down easily and the window falls by itself in the completely up position. Both switches work and the motor activates but it seems that it only goes for a few seconds and then stops.

I took off the panel and the track is clear and it seems that the cable has some creases to it. Could it be the cable or the entire window regulator with motor? The window does not stay closed and it slowly goes down when I go over bumps.

Thanks for your help!

Best Regards,
Louis