CD System

I have a Lexus IS200SE (2000 model) with the standard Radio / CD autochanger system which is built in.
I have recently been getting "ERR3" when trying to operate the system, and of course everything is locked up.

I have spoken to my local dealership, and they tell me that there is no other choice but to replace the system, but there again they would say that wouldnt they!!

Can anyone tell mke what "ERR 3" refers to, ie specific fault?
Is there anyone out there that repairs these systems, as that would be the preferable option?
Is there an aftermarket replacement available that would do the job ?

Many Thanks

before going to the Stealership...go to a stereo shop.