Hull to deck bond leak?

[sailstoo]

I am reluctant to ask this question because I'm afraid I know what the answer is. I have a 28 year old C&C 34, that's in otherwise great shape, that appears to be leaking at the starboard forward stern quarter hull/deck bond. I think the construction is shoebox cover deck over hull with inward facing flange. The deck is then through bolted every 4" through a slotted metal toerail and though the deck and the flange. There is/was some sort of sealant put between the deck and the hull flange during construction. I have minimal access to that part of the boat without removing much of the galley furniture. Got any ideas how I can stop the leak without removing the deck or tearing the galley apart? Thanks.