As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT INTERCOSTAL AT RIGHT NUMBER 4 DRAIN AND SILL AREA HAS EXFOLIATION CORROSION THROUGHOUT FASTENER HOLE LOCATION FROM BODY STATIONS 1640 TO 1682, RIGHT BUTTLINE 54. REMOVED AND REPLACED INTERCOSTAL PER SRM 51-40-02.