I've just read Ryan's thread "NCDC 2013 Radio Safe" with great interest as I'm getting the same fault.
Mine started Last week after trying to remove the stuck cdc magazine by banging on the dashboard.
I have tried to get the fault codes off the system with a cheap "My Naff Code Reader".
NCDC 2013
00052 - EEPROM Not Programmed _ Present.
00191 - CAN-Bus Max.- Config.- List not Complete _ Not present.
00199 - CAN-Bus no Communication Telematik Unit _ Present.
CDC
00062 - Replace Electronic Control Unit (ECU) _ Present.
00063 - CD-Changer Magazine Malfunction _ Present.
The "My Naff Code Reader" goes into error when reading the NCDC 2013 after its first read.
The Radio does work if I switch it off and then on selecting the tuner, if I select Nav. it goes into Radio Safe Mode.
If its possible to fix up a tech 2 session with TB, it might help both of us.