Ray,
The only way I know to disable the aux air compressor is to pull the breaker in the panel just above the inverters.
I wouldn't worry about the light.
I would worry about powering down the coach. I did that all the time on my Royale because it was simple and nothing adverse would happen. I don't think that is the case with the Marathon, so power is good.
I also didn't reset the auto start function on the generator. My coach sits in a hanger with folks there 24/7, so the standing instructions is, if you hear the generator start, call me.