CD Changer 'Magazine is Emply" message

Starting in '99 most M-B CD changers were made by Alpine, mounted in the trunk, and had a fiber optic link to the 'head' unit on the dash.
My head unit is (nearly) constantly displaying a message "Magazine is
Empty" message, even though my magazine of CDs is loaded and full of 6 CDs.
When I stop the car (engine runnning) and reload the magazine, most of the time the message disappears, and the unit begins working.
But then, when I start the car again, same message.
M-B dealer says -- "for $300 we can have the unit rebuilt."
Any ideas? or an I doomed to pay the $300 to get rid of this nuisance?
Thanks
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Something similar happened to me recently. I have a '99 SLK with a six-CD changer. I was in the middle of listening to one, then decided to change to another, and pressed the button on the control panel that would do it; I got the "magazine is empty" message.
I pulled over when I had the chance, removed the magazine from the changer and reinserted it, all while the engine was running, and the changer worked fine. That was about a week ago, and I haven't had the problem since. (I hope that what you describe isn't the next step in a process of malfunctions!)
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The Alpine unit (older model) on my wife's '95 E320 did the same thing - it was unable to load CDs. One time I was able to correct the problem by removing the unit, taking off the metal cover, and watching it attempt to load the CDs (I reconnected it after removal). I saw that the loading arm was jamming. I was able to push one of the gears with a narrow screw driver, re-grease the mechanism, and it worked fine for about another year or so. Then it failed again but this time the gears were locked solid so I ended up having to replace the unit.

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I suggest you have the changer serviced by electronic shop... All cd changer work the same way so they know what to do.
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