As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE VISIT FOUND THE CENTER FLOORBEAM CORRODED AT FRAME 20. THE AIRCRAFT WAS REMOVED FROM SERVICE. REPAIRED DAMAGED AREA BY PERFORMING CUTOUT AND INSTALLING A DOUBLER IAW EO EM-53MR-1767. THE AIRCRAFT WAS RETURNED TO SERVICE.