@boatnerd.com wrote:
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I followed a similar process while chasing a leak earlier this year. I
finally found the leak to be at a wooden box where the heater chimnet
exits through the deck.

Even a boat ashore on jackstands with a waterproof covering accumulates
bilgewater. It is a special & universal magic designed into all boats
in order to keep owners continuously & assiduously investigating,
meddling, frigging around, working and spending, so as to distract from
having time to notice her sailing faults too much. ;-)