Welcome to the forum 
Turn off the AC. Then unplug from shore power, and have someone stand in front of the microwave when you plug it back in. That may be the beep you heard. If so then I’m wondering if you didn’t experience an outage. Even a tiny one can make the AC compressor motor start back up for 10-15 minutes.
I’m just thinking out loud here.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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