The drawer problem is a belt related issue. As for the skipping, the laser lens should be cleaned, the mechanism lubricated and several electronic adjustments made. Some of the adjustments are not easy to do and require a special Nakamichi test unit plugged to different connectors on the board and an oscilloscope. The mechanism itself is quite durable. So, it is quite always possible to save them. In all cases you should use clean unscratched CDs.
