The worse area of rot is in the starboard aft corner of the cabin where the cockpit front bulkhead and cabin side and the deck beam all come together with so many joints it is difficult to seal them all. However with modern materials it should be possible for a good joint to be achieved
After forty five years something as to fail, good that it is is just in one small area in the bigger picture of the refit of the yacht.
This is one major part that did not get find until the sliding-hatch surround was removed to do the deck
A attack of the boat rats, much
get a ship's cat
Also there then it is the turn of the fore hatch and its surround and the mast step to remove.