I think you might be leaking where the keel is bedded to hull, if the boats in the water, your only option might be to check the torque on the bolts which are I think should be about 60-70 foot pounds, but I doubt that will work. I'm afraid to correct the leak you'll have to pull the boat. I had a similiar problem on my 87' 28.5, the bedding had dislodged, I used a 2 part epoxy from interlux and resealed the line where the keel meets the hull and its been fine.
