I had a good discussion with Barry Lane about this at my most recent recurrent. There is a range of possibilities, the worst being an emergency AD which requires rebuilding much of the tail (and repeating the process every 500 hours), and the least being doing nothing other than the inspections already called for since the airplanes were new.
Hopefully the first option isn't going to happen... there may be some sort of tail x-ray option as an intermediate step.
According to Barry, the issue related to an airplane which was not inspected thoroughly (or at all) for many years, and even then the tail did not fail. There have not been any accidents related to this.
This area of the tail is supposed to be visually inspected at every 150 hour/annual. I'm confident that Aero Air has been inspecting mine.