Simon,

I believe you boat has AJ hulls.....and if so yours is not the only one I know of, with soft working area decks, that is, theones between the beams

It may be prudent to take the decks off and check all the frames....and easier in the long run, than doing it "keyhole"

but in the long run....your call

enjoy it either way, and not that hard a job either way

David