As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ANNUAL INSPECTION IT WAS NOTED THAT THE INBOARD RIB P/N 215-23107-821 WAS CRACKED ON THE UPPER FLANGE. THE REMAINING AIRCRAFT IN THE FLEET WERE INSPECTED AND ALL 3 HAD CRACKS ON THE SAME RIB. THE CRACKS VARIED IN LENGTH FROM 1 INCH TO APPROXIMATELY 4 INCH. THE TAT'S WERE 3545.3, 3274.8 AND 2919.5.