We have a 2020 Thor Chateau 24F. Last summer I did a "stupid"... We set up late in the evening at a campground, and didn't get perfectly level, but good enough for the first night. So the next morning I decide to level up a little better. I started the engine and shifted into drive to inch forward. I noticed a "not so loud" high pitched tone I had never heard before. Well, I went ahead and inched forward... and heard my wife yelling from behind the coach "STOP STOP STOP!"
Long story even longer... The "very quiet high pitched noise" was a feeble alarm that the stabilizer jacks were down. So I spent the next half hour hammering and prying the jacks enough to get them retracted. Fortunately they weren't destroyed... and with a little TLC when we got home, they're fine.
Maybe cycle your stab jacks a few times... see if they are fully retracted? Other than that, possibly CO2 detector?
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