Have a 2000 E320, bought new, just hit 51k miles - wifes car. CD changer reports either "not found" or "empty" on radio readout. I had searched earilier and did in fact unhook power and fiber optic cables to changer and reinstalled, power-first order. Still the same result. Took to MB dealer yesterday for routine stuff and had them look at changer also. After runniing lots of diagnostics, they said need new changer, would be $500 exchange. I said no thanks, they charged me $48 to troubleshoot. Q can I buy a rebuilt unit cheaper somewhere else? What options do I have? I did searches on this and only found one dealer offering to sell changer unit for $599!!