As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING OTHER MAINTENANCE, A CRACK WAS DISCOVERED IN THE LEFT CLOSE OUT RIB. THIS CRACK EXTENDS VERTICALLY THROUGH TWO FASTENERS HOLES IN THE FIRST ROW OF ATTACH HI-LOKS BETWEEN THE AFT TRUNNION SUPPORT AND THE CLOSE OUT RIB. THE CRACK EXTENDS BETWEEN THE SECOND AND THIRD HOLE VERTICALLY OF THIS ROW, AND MEASURES .500 IN LENGTH. THIS CLOSE OUT RIB WAS CHANGED WITH A FACTORY NEW PART.