The one problem I did have was a leak that showed itself as fresh water in the engine room floor – only when sailing in heavy rain. Turned out to be the sealant around the cockpit drain had failed allowing water to run down the outside of the drain pipe rather than the inside.
It was fixed with a good dose of higher quality silicone.
But I will check the state of the skin fittings and report back. Very difficult area to work in on my boat due a 3.5Kw Whisper genset (AKA Thumper) at the rear of the engine room.