Welcome Rob! Rich (vcrt) is a fellow 2470 owner who did a lot of rebuilding work on his trailer. Hopefully he sees this or you could send him a PM.
When the lower awning bracket becomes loose, that's often a sign that the rot is worse than it appears. Chances are you'll have to replace a few square feet of wood, not just a board on the edge. But you really can't tell until you get into it. Not sure if it's the front or rear one, but if it's the bedroom area one with carpet, that'll be hard to see until you pull the carpet up. If it's in the bathroom, you should be able to look for discoloration in the vinyl flooring- it'll turn black if the wood is wet/rotting underneath. I believe you have a storage door back there to access under the shower, and you should also have an access panel to unscrew. You could put a slice in the vinyl under there to see how the wood is.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR