That is a well documented fix and at one time the factory was paying for it. I'm sure someone more familiar than I am can chime in with details.
I believe the top is not fastened but just 5200 to the hull extension. If I recall the fix was take off the top, remove all the waterlogged foam, either install a bilge pump or drill access to the hull proper to connect the two bilges, and install access hatches to the top before replacing.
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