Telephoned to see if my ancient Mercedes COMAMD from a 2000 CLK could be repaired at it no longer read the navigation disc. Spoke to someone (forgot their name) who advised they should have the part in stock and to send the unit in.
Unit arrived at Revtronic today and just got off the phone to say it's been fixed and on it's way back.
Price for the fix was a lot lot less then a new unit for around £2000 from Mercedes and the turnaround was so fast but then this shows they know what they are doing.
Happy to recommend.