So I finished cleaning up the boat today.
We clipped some sort of dead head in the water and broke a cap off the rail and the screw popped out so that was why we took on water every time we buried the rail.
We're going to have to re-fibreglass the spot and then put a new screw in and seal it and put a new cap on.
Also, and I'm looking at the Captain for this, someone forgot to turn off the drain to the sink in the bathroom and when we went over on lean and kept burying the rail water would come washing in.
There was some laughter as the Captain kept trying to explain it must have been his wife who did it.