help on replacing cd changer
 

Hi everyone, I hope someone can offer advice as I know little about audio.
I have an Avalon and the cd changer in the trunk has popped up an error code. Dealer said he can't fix it and a new one costs $1400!!! I've read that if I buy an aftermarket cd changer it will not be compatible with the interface inside. Does anyone know what my options are. Maybe tell me of any places that can help me out?
Thanks!