Ian and Judi. I had one such leak and the inexplicable thing was that some times it was fresh water, and other times it was salt water. I even took the boat all the way from Greece to Hyers to have Amel technicians' diagnosis. No clue. To make the long story short, it was as leak that came from the outside rail around the hull. There was a small crack in the junction of deck to hull. If you need more details, let me know.