I have a 37KT. Your last switch is the power shut-off switch to disconnect all power for storage. Thats the clicking sound you hear.
I found I have to close the screen door (only) to get the stairs to retract, then reach thru the slide to turn off the power disconnect before closing the exterior door.
It's odd that all of them are unlabeled. The only 2 I have without labels are for the front and the rear overhead light sets.
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