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This is a pretty common problem on this model. It can be either the laser unit - which comes with the sled/tray, or it could be a belt. If you look under the CD mechanism, you should see a belt going from a motor to the pulley on the spindle. If that is worn or wearing out, it will have to be replaced.
If that is ok, then it could be the CD mechanism. The part # ***** KSM 213 BFN/C2NP - thelaser, with spindle motor & sled motor complete.
Let me know if you have any questions.
Ok. Sorry... was this not the problem?