This is from the MSHRV website for the 31W:
New features for 2018 include a new front cap with LED clearance lights, tankless water heater, induction cooktop, convection microwave, kitchen pop-up outlet with charging station, new slide-out facia, lighted battery disconnect switch, interior step light into the bedroom, stainless steel lav bowls IPO plastic, exterior lights on all storage compartments and solar wiring prep.
There wasn't anything about the 31L.
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