Doug:
I have not had to chase that particular leak area so far... I would recommend you check the area around the tabernacle / mast base. The wiring for the mast also (on Pygmalion W32 #567) penetrates the deck and goes down inside the head to the bilge.
Sources of the water include running down the wires through the hole in the deck, each bolt for the tabernacle etc.
Allowing water to get to the plywood between the deck fiberglass layer and the cabin fiberglass layer. The water over time will cause the plywood to rot / soften etc - not a good thing.
Notice the carriage bolts that secure the deck and beam below - another possible source of leaks.
THT
Jay Bietz
Web master