Had a mouse problem with a 2720SL that seems t be fixed. Underneath I stuffed a couple of small holes around plumbing pipes with stainless steel wool. I don't think that was the entry points. In front of the slide-out there are a couple of posts that go up through a rubber seal that goes across the width of the slide-out. Over the years that seal has lost some flexibility and sealing ability. I put an escutcheon on each post. What's an escutcheon? It's a round plate with a hole designed to go around plumbing pipe where it passes through a wall. It's split in 2 with a hinge that allows it to be opened and closed. Put an escutcheon around each post below the rubber seal and fix it so it can't be spread open. I didn't attach mine to anything. They don't interfere with opening the slide-out.
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