E320 wagon retractable cargo cover.

[desert]

I have a 2004 E320 wagon with a electric motor operated vinal cargo cover that retracts when the rear deck lid goes up and then back when the deck goes down. It's a nice feature here in Arizona because it shades what ever you have in the cargo area. Problem is, it no longer works. Has anyone had one of these go out on them? If so how was it fixed, was it necessary to replace it and at what cost or can they be repaired? Any info will be appreciated before I go to Mercedes...Thanks, Desert.