As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIB HAS CRACK RADIATING THROUGH FASTENERS ATTACHING RIB TO SPAR AND A PIECE IS MISSING APPROX 6 INCHES LONG AND 1/4 INCH WIDE. CORROSION EVIDENT, POSSIBLY DUE TO INSULATION BEING WET. THIS DEFECT CAN ONLY BE SEEN IF LEADING EDGE IS DISASSEMBLED.