[RMcNeal]

That helps. Mine is a 2019 3791RD. My fridge is inside the off door side slide next to the stove and cabinetry. The second valve on my unit is under and behind the drawer to the right of the stove and the left of the fridge behind a false cabinet back. The back is a thin panel that is screwed to some firring strips on the sides of the cabinet.
The 3 digit model number usually indicates that the model is a High Country vs. a Montana legacy model. I have found 372 and 373 models in the High Country line, but not a 379? Are you certain of the model number?