As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE: C AND SI CORROSION ON INTERCOSTAL SUPPORT CONTROL CABIN FLOOR, BL 0, FS 277 TO 29 4.5. CORROSION CLEANED AND SUPPORT FOUND TO BE OUTSIDE LIMITS. NEW SUPPORT FABRICATED IAW BOEING DRG 65-17593. NEW SUPPORT INSTALLED IAW SRM 51-30-2 WITH REFERENCE DRG 65-17593.