2003 C230K Panoramic Sunroof

[BenzBob]

I recently purchased a 2003 C230K coupe with the panoramic sunroof. No matter how slow you are going there is a constant squeak of a rubber to glass/metal sound coming from the back edge of the sunroof. The sound goes away when the sunroof is opened in either of the two ways permitted, so it must be coming from the rubber gasket where it meets the glass panel. Is there a fix for this problem? Do I need to take it back to the dealer for adjustment or will silicone sprayed on the gasket resolve the problem? The squeak is constant, not just when you hit irregularites in the road, but steady as you go travel. The sound is driving me crazy and I would like to do something about it as soon as possible.