Just a guess, but just inside the entry door, on the left side, should be a switch!
Was that way for my last HR, and my current Monaco! Rail!
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Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"