Hi Andy, I have a 1981 Mk2 N33. I had her re-rigged in 2014. The riggers reported a similar problem to yours. I discussed this with ‘Navigators’ based at Chichester Marina. They advised that there was not an immediate risk. The door to the heads is fine the sliding door is a bit stiff, but no other problems. Navigators advised vigilance without action. It does not appear to have developed since. I have not noticed and pools of water at the base of the mast as you describe. When I go down to the boat again in a few weeks I will have a look for what is being compressed and check the pooling.
I do not seem to have any leaks.
Best Wishes Pete (Miss Rosie)