Welcome to the forum.
We have a 2808C and it has a textured aluminum roof with several seams, running from side-to-side. I was just on top of it yesterday checking for any possible spots where leaks could occur. I found a potential leak where the awning brackets are mounted, so I applied RV caulk there. Also, on the "rain gutter" I found some of the screws that were not all the way in. They were tight, but just not driven in all the way. So, I caulked around a few of them.
Good luck!