From your photos, I see no need for a new roof. I'd remove the old caulking, clean things up and neatly re-caulk with Winnebago's specified sealant, for which Manus 75 AM is a match. After doing so, for extra protection I'd add a layer of Eternabond tape which will minimize the risk of wind getting underneath the edge. You'll need to make sure the piece that's popped loose is properly inserted into the aluminum extrusion, sealed and taped.
There's absolutely no need to goop it on like seagull s*&%.
For what it's worth, I'd avoid going back to the shop that recommended replacement, IMHO they're trying to rip you off.
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Bob C
2002 Itasca Suncruiser 35U
Workhorse Chassis
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