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Temperature change is 30 degrees. I don't drain the water heater and low point drains unless its winter, so no.
I think I will try the suggestion to flush the toilet and open a faucet when we exit the RV and see what happens. Residual water pressure seeping past the flush valve seems possible, but the toilet does not seep when under water pressure from pump or hose so I'm not sure about that.
How about haunted rodents! Thx all....
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