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A start: https://www.steelsoldiers.com/showthread.php?173099-Manuals-for-the-MEP-806B in case you don't have TMs
http://www.liberatedmanuals.com/search.mpl?q=806b&Search=Search
Trouble shooting section - p181/506 in TM 9-6115-672-14 circuit interrupter will not close