Help with switch identification for Sandstorm

[PPSquilter]

Have just purchased a 2015 180SLC Sandstorm. Is there somewhere that tells what switches are inside? There is a double, 2 switch, just like the light switches inside the door and bathroom that is located next to the fuse panel and battery shut off I don't know what they are for. Thank you for your help

[PPSquilter]

Found it, these are fresh and grey water tank heating pads ... turn on at -32!