As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
1 5/8-INCH CRACK ORIGINATING FROM THE FORWARD END OF LOWER FLANGE OF THE AFT INBOARD RIB. CRACK EXTENDS BEYOND THE FIRST RIVET OF FLANGE THEN SPLITS INTO 2 CRACKS WITH ONE ALMOST TO THE SECOND RIVET AND THE SECOND MOVING TOWARD THE RADIUS OF THE BEND IN THE FLANGE.