I have a 2008 Fleetwood Tioga, 31M. As you enter the door, there is a small panel with three switches on the left hand side. The switch on the left works the outside patio light. The switch in the middle operates a single interior light, but I can't figure out what the switch on the right operates. It has a small red indicator light that goes on, but I can't see that anything comes on. Can anyone with a Tioga tell me what this switch is for? ( have attached a photo. I hope it comes out ok)