The CD changer is a notorious problem. It has been discussed here many times. You really have 3 options, Open it and try to fix it yourself, as the dealer won't fix the cd player, they will just want to replace it as they don't have an audio electronics technician on staff, and are no more qualified to work on cd players than you or I. Next is to replace the stock CD player with another one. While this may fx your problem, it may be come an issue again as previuosly stated, this happens alot with the stock cd changer. And the last option is to just replace it with an aftermarket, better cd player. Which is the route most other go.
If you choose to replace the stock unit wioth another stock unit, we have as authorized vendor, DCfish who can get you another CD player.
Thanks Smooth, The reality is that I won't even handle/sell those changers, They are a liability.