Welcome Aboard
What year and model do you have?
Honestly from your description I do not have a clue! If I was forced to guess I would guess the CO2/Gas detector. When I plug in shore power I do get a short "Beep". Only things I can think of would be the CO2/gas detector, Inverter, or the Frig. Have you ever, just walked in/around to determine where the sound is coming from?
Edit: 2005, I would go with the CO2/Gas Detector!
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