Okay, that is a totally different item than I was thinking. Those are the LED all laid out in a row and they do not look like something we can replace very easy.
But knowing how reliable LED can be, I would then move to make sure power is getting to them as wiring and switches are more prone to fail than the LED array itself.
I would want to take it off the ceiling and find where the power connects to this fixture and see power there and that there is no a loose connection or something else keeping it from working. Possible this one fixture is on a circuit breaker/fuse by itself? Possible but not one I would bet on. Possible that little switch is bad? Not too unusual, but then that can get into changing out the switch and that might get tricky to find, so I might want to start shopping for a replacement at that point.
Just my way of thinking on the issue and certainly not the only way to go.
What makes RV so fun? All the new things we get to learn! Kind of like banging our head on the wall. It feels so good when we quit!
2015 Winnebago Vista 31KE on 2014 chassis