Funny how a high pitched sound is hard to pinpoint. I could hear it all through the house.
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AC output was normal, 76% SOC left, but along with the sound the touch screen would not come on. No Firmware updates for anything.
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I turned off the AC output and the sound stopped. Then I shut it all down/restarted and it seems to be okay. No alarms listed on the touchscreen.
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Weird
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