As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INBOARD RIB WAS CRACKED AT LEADING EDGE. CRACKS BEGIN IN BOTH UPPER AND LOWER FLANGE RADIUS AND PROGRESSED THROUGH THE FIRST RIVET HOLE IN THE WEB. CRACKS EXTENDED ABOUT .5 INCH PAST THE RIVETS WHEN DISCOVERED. THE ELEVATOR BALANCE WEIGHT SUPPORT BOLTS TO THIS RIB AND IS LIKELY A FACTOR IN THE CRACK DEVELOPMENT. THE RIB DOUBLER WAS NOT CRACKED.