I don't have your floorplan, but the hot water heater bypass valves should be directly in front of or near the hot water heater. So depending on it's location, you may have to remove an interior panel. Mine has a door which makes it easy.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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