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I had this same problem with a 2015 (under warranty). Keystone sometimes wants to "patch" it, sometimes they will authorize a dealer repair that doesn't involve dealing with the underlying OSB and just replace the membrane. I know of two cases on Carbons - mine and one in CA where the dealer repairs were "unsatisfactory" due to the OSB pulling up with the membrane.
You can try to re-glue and to patch around the AC. You could also do a partial roof membrane replacement, which would create an overlapping seam that needs to be sealed.
On a 37' RV, a proper roof membrane replacement - retail runs around $8000. Proper replacement means re-decking with OSB (I'd prefer ply, if I was going to do it) or decking with 1/8 material that creates a "clean surface" for the glue....
No reason for that to come up, IMHO...
Like others, when mine ballooned, it cut itself on the AC frame.
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