Possible outside porch light or front-end nose lights. Wait until it is totally dark then turn it on and start looking.
On the inside after you turn it on, it could be accent lights on the slide-out.
When we bought on new Road Warrior in 2017 it came with 60% of the switches unlabeled. We had to use the wife's label maker and find out what switch went to what lights.
Good Luck!!!!