Hi Peter
I’ve a 2001 Bavaria 34 several years back I decided to remove all the stanchions and toe rail ‘s I was horrified there was hardly any sealant as the deck sandwiches onto the hull. I ended up re-sealing the whole yacht just to be in the safe side That was back in 2007 I think I’ve never had a problem since. Your leak could be coming in any place on the port-side and running down
Hope this helps
Mike
Artemis
