Hi svlark. Before you get into this if you haven't already! Check your outside deck thickness. Mine were 1/4 + versus a single
layer beneath. So I would say the external layer was the structural part. Fixing from underneath is not an issue unless you are lazy or don't understand how to do it. To say you don't want to take apart the interior
finish? is a non starter. The factory did it in reverse. I understand they were working in 1 direction, but you will save the structural integrity of the deck if you go from inside. It's not rocket science, just determination to go from the inside. I did both side decks sections, inside the cabin
, and into the aft lazerets in about 2 weeks. This includes taking the interior
sections out and fixing the problem. IT'S ALL ABOUT THE PREP TIME, AND THINK PROCESS.! I did 5 sections in 5 weeks. I was lazy , and it was winter. Heat lamps work wonders. No I am not a professional. just like you. I just read how to do it and them looked at my situation, and went from there.