As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING INSPECTION, MAINTENANCE FOUND SEVERAL FATIGUE CRACKS IN THE CENTER AISLE FLOORBOARD WEBS AND FLOOR FRAMES BETWEEN STATIONS 174 AND 427. THESE CRACKS WERE FOUND ON BOTH THE LT AND RT SIDES OF THE AISLE. BOTH WEBS WERE REPLACED.