I have a similar problem. My player just doesnt play anything anymore. I was not even able to eject or load any CDs. I brought it to a radio shop, and the guy was not able to fix it. He removed all the CD's and suggested me to buy a new one. I found on internet repair service
Automotive Radio and Changers Repair Services :: 6 CD Changer Error Fixing and they fixed it for 199+shipping... Don't even try to repair it youself.