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 FLOOR BOARD FASTENER HOLES 2EA HAVE CORROSION IN THE BORE BETWEEN STA 294.5 AND 312 AT APPROX LBL12. MAIN CABIN FLOOR STA 294.5 - 312 LBL 11.1 BLENDED AFFECTED AREA ON INTERCOSTAL TO REMOVED CORROSION, REMAINING MATERIAL FOUND TO BE BEYOND LIMITS IAW BOEING SRM 53-10-51. REMOVED AND REPLACED INTERCOSTAL IAW BOEING DWG 141A5600 REV:N SHEET 2 AND SRM 51-40-02.