Recessed light under door/inside of steps

[Glenn the fifth]

Okay, I have not seen this question before but I bet someone will know what I am talking about. On our trailer (2012 3402) there is an orange light mounted about a foot inside of the top step (outside not inside). It appears to be a light to help show you where the stairs are when it is dark. After 4 or 5 trips now with this trailer (and having owned a 2006 Montana in the past) I have figured out how to operate everything but that one little light...

Any ideas?

Thanks, Glenn