In dash cd changer runs constantly. on 2005 Mercedes-Benz E500 4MATIC

Our 05 e500 has an in dash cd changer that rercently began to run as if it was trying to play a cd but their are no cd's in the changer. It will run for a few moments, then it will stop, then start again. Sometimes the cover plate will not close when you press the button, then it will close after the car has been turned off for a while.

The unit will have to come out to be repaired.
There are many companies that specialize in repairing original equipment factory stereos.
Thanks for the info.