I have seen in other Seidelmanns the thwart stringers under the floor have problems. They consist of wood that is fiberglassed in place from front to back to give the hull support thwart wise and also provide support for the subfloor and teak and holly plywood atop that. Well, the ends were not fiberglassed so that water could get into the wood and over time rot it and because the fiberglass casement was strong enough (thick enough) to support the floor and humans, it didn't matter so much, but on models where the mast compressed on this structure, there was a problem. Many are stating that aluminum steps were used, but if they are situated on top of this thwart structure, it could be a problem The S-34 was one of the later designs, so maybe Bob Seidelmann (now gone) corrected the problem. But, you might just want to check it out to be sure. It is all fixable, of course.