As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: CABIN FLOOR STRUCTURE, INTERCOSTAL CRACKED AT CLIP NUT HOLE. LEFT BUTT LINE 45 BETWEEN STA 312 AND 328 FLOOR BEAMS. COMPLETED DRILLING UP AND INSTALLING REPLACEMENT INTERCOSTAL PER BOEING DRAWING AND AARD 51-00-05.