So all the seacocks are bonded. Apparently a no-no when it comes to wooden boats. I understand the wood can suffer from something called delignification. The seacocks are corroded and on the outside show areas of increased underwater growth- which I assume is from a loss of antifoul.
On one seacock there is a small area of delignification, where the top of the plank seems as though it's going 'papery'. Turning fibrous.
I have taken the seacock off, allowed to dry, stopped any leaks allowing water getting to the area. The hull seems in good shape there. I asked a chap that is working next to me (a professional) what he thought- it was pretty much what I thought... Clear it, see what the hull is like. Re-inforce with a backing plate when putting the new seacock on. My thought was to epoxy the surrounding area (in the planking). Perhaps slight drill holes, and inject the epoxy to strengthen the area. Still seeking advice for it, but doesn't seem too bad! The others seem fine.
It was wierd that my battery the day after lifting out of the water was completely flat.. and I noticed the antifoul areas around the seacocks.