Hi guys hope you can help I have an 2003 RR and have lost sound on the radio and cd etc I took a look at the modules discounted them and cleaned them put it all back as it was and now the onboard computer has stopped working. I still have power there a the screen is faintly lit and the orange light turns on and of on the radio side Also has anyone got any picks to identify witch module is what thanks in advance

I had a plethora of differing symptoms a few weeks ago, one of them being with the radio/CD and computer screen, just as you described having.
At other times the interior dash indicator lights and audible indicator sound would also stop working. And then just the one single indicator wouldn't work.

Checked in the rear L/H side compartment and it was all bone dry - Turned out it was the LCM (light control module), located on the front R/H footwell, the unit was damp.

Replaced it last week, It's posted in the forum. Along with a helpful how to get to and remove it
by Fisha.
First started in october this thread here http://www.fullfatrr.com/forum/topic14336.html

Final thread here. http://www.fullfatrr.com/forum/topic14945.html

Audio unit location
http://www.youtube.com/watch?v=7eaRPRfXKr4 -03V td6
-72 Cadillac Coupe DeVille 7,7liter.