The short lived lamella roof option on the ML was a catastrophe. I am actually surprised if this is the first issue you've had since '99 on it. They are noisy, they rattle, they leak and are very prone to expensive mechanical failure. This is something that you will need to take to a MB facility.
\'06 E 350 (Yes, it\'s loaded)
\'04 G35 Coupe 6MT (Traded in 4/06)
\'02 CLK 55 //AMG (RIP 8/04)
\'97 C 230 (Traded in 12/04)