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The MPU only does it's job after the unit is cranking, as far as I know it doesn't do anything to the cranking circuit itself, so that isn't likely to be your no crank issue.
Not sure on this unit, but I know on civilian generators you can get an MPU error if the unit thinks it's supposed to be turning over but doesn't.
If you are hearing a slid "clunk" when turned to start but it isn't cranking, I'd be suspecting the starter of having issues. If it's the "tick"...
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