I am just about done repairing my sunroof. I had the same problem, the cable were popping out of the track right at the access plates. So far I have replaced the cables, one lift mechanism, lubed the tracks (NOT THE CABLES) with sunroof grease bought from a Mitsu. dealer, (evidently they have a superior grease according to my MB service rep) During the process I discovered the controller portion of the motor is not functioning properly. The microswitch that determines when sunroof is raised is not working and the motor keeps trying to raise roof further than it should. This is the part that I am waiting on from Germany. I wish that I had take pictures during disassembly, however I found the MB DVD to be very helpful with the little video "how to" section.

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD