Here's an odd thought (don't ask how I know) ... do you have an outside shower head, and did you close it after you winterized? If it is open then water would continue to flow and the pump would continue to run.
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Now: 2019 Winnebago 2500FL w/e2 WDH;Sold: 2015 Bullet Premier 19FBPR (shown)
2012 Ford F-250 Lariat Super Duty Crew Cab (gas 6.2 L, 3.73 gear ratio 2WD, 172" WB)
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