My sun roof has been clunking when opening and closing and also it has been rattling when fully open. I've been ignoring it for a few weeks. Now it won't open or close without manual help. I seems like the drivers side isn't moving. When the car was new (it's a 1994 C280) it was worked on a few times by the dealer. It acts like a screw may have just loosened up. How do you get at the tracks? do you have to drop the headliner? Is there something I can look for and fix? Do I need to bite the bullet and bring it to the $$$ Dealer $$$ ?

Thanks
Ken