It's possible. Active dry rot keeps rotting. You'll have to research solutions. I've seen products that can stop further dry rot. Most likely any fix will require opening up the roof to expose the damage and repair/replace.
I'm not saying that it is dry rot. But it is a good posibility. It's also possible that moisture has broken down the glue in the OSB and weakened it creating a soft spot. I don't know if that's supposed to be water proof or not. Either way, the only way I can see to fix it is to do surgery on the roof.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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