As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RIB THAT IS BEING REPLACED AS PART OF THE SERVICE BULLETIN WAS FOUND CRACKED DURING AN INSPECTION WHILE AT BASIC CHECK. BY ACCOMPLISHING SB 170-57-0047, THIS EO ALSO PROVIDES A REPAIR BY REPLACEMENT OF THE CRACKED RIB. ENGINEERING HAS CLASSIFIED THIS REPAIR AS A MAJOR REPAIR.