"The rudder breakage on a (since discontinued) composite rudder post was a KNOWN problem to Hunter and they issued a bulletin to owners on the subject in 2005 after 16 reports of failure. "
My foolish assumption, that if rudders were known to break off, a manufacturer would have issued a recall of some kind rather than, what? just sending out postcard saying "Keep an eye on your rudder" ?
there is a strict product liability under the Uniform Commercial Code, Magnusson-Moss Act, and other statutes for hidden defects that would pretty much make the builder responsible for coming out and replacing the rudders. (Which is not to say some vendors wouldn't try to ignore that cost.)
Dunno, not my department.