Here's something (from another forum) that should help you along.
Stuck CD - MBWorld.org Forums
I cannot see a dedicated fuse for the CD unit . My best guess would be for fuse 26 (sound system) located in the cockpit, drivers side. Open the driver's door and pop the upper trim revealed to get access to the fusebox.
Stuck CD - MBWorld.org Forums
I cannot see a dedicated fuse for the CD unit . My best guess would be for fuse 26 (sound system) located in the cockpit, drivers side. Open the driver's door and pop the upper trim revealed to get access to the fusebox.