SOURCE: 51A2 System Cover has probably been opened.
The chassis intrusion detsctor has been set off. You'll need to look at your owners manual for the steps to reset it. Good luck and hope this helps.
Close the inner cover to resolve the error condition.
Inner cover open 1
Inner Cover Closed 5
Press the <Resume> button after closing the cover to resume printin.
Also
Follow these steps to reset the printer:
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