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You may have TWO grey boxes that power the compressor. The one that Dean described is the infamous well pump switch. As he stated it controls the cut in and cut out power. It usually will have Square D on the cover. You may have a second grey box, this one is activated by the HWH leveling system. If the leveling system is in AUTO, it will activate the pump, and most importantly OVER RIDE the well pump pressure switch. The HWH system is placed in AUTO by pushing the level (air) button twice.

If you pull the covers off either switch, keep in mind you will expose 120V live circuitry.

Yes, for sure have two boxes.  The Square D and what I’ve previously called “the box my compressor is wired into”.  

In this latest pump failure the coach was shut down in what I call manual mode where I have pressed air button and raised and lowered coach to get level manually and then shut coach down.  

The night before coach was shut down on Off/Travel and it didn’t have an issue although it’s possible I may have blown a gasket when in travel in the past, but I can’t guarantee it.  

Last two have occurred when in manual leveling mode.  Hopefully some of this info helps.

Edit: After I posted this I re-read your response. I’m not saying it’s impossible that I hit the Air button more than once while I was manually leveling. Kind of like when I wanted make sure I was not in travel before I adjusted again. I don’t think I did that, but I would not bet my life on it.