The white switch is probably for a second or third air conditioner. It allows you to choose between two air conditioners and the microwave. There just isn't enough power for everything. In my Elkridge, it is pre-wiring for a third air conditioner I don't have (it was special ordered for the third).
I found the board in my 2014 Elkridge 37 Ultimate by pushing buttons on the remote and listening for the relays on the board to click. Mine was behind the microwave.
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