As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE SHOP HEAD OF THE RIVET ON THE RIGHT SIDE OF THE VERTICAL STABILIZER, JUST ABOVE THE FUSELAGE THAT HOLDS THE AFT INNER CHANNEL TO THE SKIN, WAS BROKEN OFF. THIS MAY HAVE BEEN CAUSED BY VIBRATION. SUBMITTER KNOWS OF SEVERAL INSTANCES OF SAME RIVETS ON BOTH SIDES BREAKING ON FLEET AIRCRAFT.