I just bought a 1987 S2 9.2c and while inspecting the boat found that a narrow section of the teak flooring on the starboard side of the cabin is stained from what appeares to be moisture. Upon further inspection I found one of the water supply hoes connected to the sink in the head was dripping. I fixed that problem but I don't think that was causing the flooring issue. I saw some posts relating to water tank failures on these boats but they did nor identify what the tell tail signs of the water tank failure were. The bilge in the center of the boat forward of the keel is absolutly dry and clean and from what I can tell the water supply lines run down the port side of the boat. If any one has had some prior experiance with what I am describing I would appreciate hearing about it prior to going after the water tank as the most likely problem.