I did another search, and this is what came up on a forum with someone who had a similar problem:
"Mechanical problem. CD mech (or pickup if sold seperately) needs to be replaced. Check parts.pioneerelectronics.com for availability of parts. If you need help installing/removing, let me know."
Here is a link to the thread (which really doesnt have any additional information:
http://forum.ecoustics.com/bbs/messages/4/312719.html