Sounds like more than a closed winterizing valve on the hot water heater. But that would a place to start. Otherwise I would be back to the dealer and let them deal with it. Another good reason not to rush PDI.
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2017 Chevy 2500HD LTZ DuraMax Diesel Silver Ice Metallic
2017 Outdoors RV Timber Ridge 25RDS Mountain Series 4X Off Road Suspension Pkg
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