As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED MAINTENANCE THE LEFT AND RIGHT PRESSURE FLOOR SILL AT FS 559.0 HAD AREAS OF CORROSION ON THE FLOOR SILL ANGLE. THE AIRCRAFT WAS INSPECTED AND REPAIRED USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT WAS RELEASED FOR SERVICE.