How to remove ceiling fixture in bedroom

[Mellinkat]

We have a 2008 25' Safari SS. The ceiling light over the back bedroom recently decided to quit working. Worked in the morning; didn't work in the afternoon. No travel on that day, but it was raining (not sure if that is pertinent or not but made a mental note of it). The fuse reads good for the "bedroom" and it is the only electrical fixture not working. The bulbs (LEDs) were tested in another fixture and they are both good. We are trying to remove the fixture to see if any wires have come loose, but can't figure out how to get any further than the attached picture. We removed the bulbs and removed the screws. There must be a catch or a latch somewhere on this fixture that will allow it to come loose. Can anyone help us get it off the ceiling so we can check the wiring? Or is there a better way to proceed? Thanks for any en"light"enment that you can provide. It's pretty dark back there!!!