Well, I tackled the repair today. When I removed the cover, the first thing I noticed was that all 3 screw holes had become elongated. Going to bigger screws wasn't going to provide a fix. I decided to try a different approach to the repair, since I had already purchased the compression nuts that Harveyrv had recommended in another thread. I drilled out all 3 holes just large enough to accommodate the nuts, compressed them to sit them in place, then removed the screws. I then replaced the cover, and screwed the 3 screws in to within 1/8" of tight, then silicon caulked around the edges, and finally tightened the 3 screws and cleaned up the caulking edging.
It looks good and sturdy. But boy, is that aluminum layer thin!
