MBWorld.org Forums - Sunroof Issue

Hello. My car is a CLA250. I have problem on my sunroof. I guess something is broken or loose. Front right side I can lift it one centimeter but on the driver side can’t. When the car is moving, the air get into the cabin and also you can feel the glass a little loose. I asked to the dealer and the cost for this job is USD1500, which is extremely expensive in my opinion. They say, mechanisms, guide rail and others need to replace. I would like to remove the glass and see what is the problem, but I need some directions or manuals. Someone can help me with this? Thanks Tomás