I got back an email from Ed Ebble and he said to send the radio head and the CD changer in for a rebuild one cost $225.00 more reasonable than I hoped.

now my big question is since I have no talent and have never done a radio removal for a Mercedes-Benz are their instruction in the DIY site to help me out . I still want to know were fuse C is on the engine fuse box.

however I am elated to fine out it is this simple.

Sincerely
bob Geco