I have a Mod 3 Capri. When I go on vacation up to Wisconsin I sail hard and keep my Capri in the water for a week. We have a blast sailing on the big waters of Green Bay and Lake Michigan. My problem is that the boat will slowly take on water to the point where by the end of the week I may have 10 gallons when I pull it out and drain it. My drain plug is good and there are no visible cracks in the hull. I believe that I am getting water forced up through the centerboard slot and it must be getting into the hull where the centerboard box attaches to the floor. This spring I plan to I replace the sealant where the centerboard box attaches to the floor and also replace the centerboard seal strip. Can anyone provide advice, pictures, diagrams on how to do this work? Is this done with the boat right side up or flipped over? Type sealant to use? Any help would be appreciated.