Not a dumb question. Unfortunately I don't have an answer. However, that looks like an LED light fixture. You may or may not be able to replace the bulb. Someone else here may have taken the cover off of theirs. If you cannot replace the bulb, you can probably get a new fixture under warranty, when you can get the cover off.
Also, noticed you are in Bedford, we are in Kalamazoo.
2015 Jayco 24FBS Elite Jay Flight
2013 Chevrolet Silverado 2500HD 4X4 6.0L 3.73 Axle
HD Trailering Package with Integrated Brake Controller
Equal-i-zer Hitch 10k/1000