• I'd take a punt that the internal diagnostics have recognized a possible mechanical error arising from one of the mechanical parts of the stereo system. To repair it, you'd need to isolate the mechanical part in question and test the various components for wear, dirt or failure. To do this quickly and safely, you'd need the service manual, which may or may not be available for purchase/download depending upon the year of manufacture and the brand.
  • I shall take a wild stab in the dark at this and means it's broken.

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