I was once told by a technician that a Phillips CDM9 transport, which was one of their better mechanisms had an estimated useful life of about 3500-4000 hours. Whether that is true or not, I don't know. If your player has a lot of hours on it, I would consider replacing it. I have a 10 year old Marantz cd94 that I have used for many years as a transport with Theta and Micromega dacs. However, I could not stand to listen to it without a jitter reduction device.
The Aiwa mentioned above, in its stock form, is comparable as a transport to the Marantz (not bad considering its price). A used Theta Data Basic (mentioned above) will imho outperform the Marantz and many other transports.