[quote=boatbore]I'm not familiar with the mystere line of boats but from your photo, it looks like someone peeled the deck plate open to inspect the hull for some reason. They don't just come unglued. Perhaps a daggerboard trunk leak. You need to do a through inspection of the hull. Probably remove the deck plate the rest of the way so you can clean it up and reattach it properly.
I'm sure someone with more experience with this boat chime in with more information, but this is an old boat and you need to look over everything very carefully.[/quote]
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