Mysterious red light on top of the camper ('06 Model 2619)

I have noted that when the camper ('06 Model 2619) is set up, there a small red light that from a distance resembles an LED. It is located at the top of the camper on the back of the front shell seal about two feet from the left of the side of the camper opposite the door. It and can only be seen from a position in which the eye is level with the top of the camper. I've observed this light when the camper is on either battery or shore power.

Can anyone tell me the purpose of this light?