I just purchased a 1998 windsong from a car dealer who didn't know much about the coach. On the dash, next to the rear view monitor, there are 4 toggle switches. The bottom switch is missing it's id or name plate so I don't know what this switch is for and neither does the dealer that sold the coach to me. Can someone please tell me what it is for? Also, what kind of fluid do you use for the leveling jacks? And what does the yellow light indicate on the leveling jacks panal?