Brief update on my progress with Blue J. I've removed all the transom thru-hulls and the rudder and gudgeons. Not only is there exposed core at every hole, but none of the fittings or bolts were even bedded.
Yesterday, I cut the propane locker out - that will give me much better access to the starboard transom to replace basically all the core. I'm using a small cabin heater and a trouble light to heat and dry exposed core inside. I expect to start re-coring, etc. in March, when the weather should start to warm up.

Peter