Stick corks in the cockpit drains and dump some food color in the hoses one at a time top with water and see if yu can see the die in the bilge. That might work on all hoses. Another spot can be when the motor is hot a crack in the exhaust lets water in when it expands.It could be an exhaust hose as well.
Shower sump leaking????You will find it just make it a game of hide and seek tag your it.