We see a lot of issues with electric window regulators, common symptoms include strange noises and windows not lifting properly. If you experience any of these things its best to not operate the window until you can get it repaired. Because occasionally the cable can snap, and the window will drop completely inside the door. Like this one did yesterday on a clients MK5 Golf…
Here you can see whats involved in the repair. The outer door skin, inner door panel and the window itself have to be removed in order to replace the regulator.
Outer Door Skin Removed 
Inner Door Panel Removed 
Genuine Window Regulator
Finished and ready to go…