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njmatt50 did this repair... he replaced the section with flexiteak (I think) He did post
thread tittle: "340 Windlass core rot repair complete!! Pics and details along the way"
I can't answer your question, but I had that same section of deck replaced on my 340! Water intrusion from the anchor chute bolts, I was told. Luckily found after someone hit my anchor and bent the chute. FG guy had to open up the area you indicated to dry out the core, then re-glass.