As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN AFT WET AREA FLOOR STRUCTURE BS907- BS927, LBL.51 INTERCOSTAL IS CORRODED AT MOUNT. GROUNDED - YES. EVALUATED CORROSION -ORIGINAL THICKNESS .150,REMAINING THICKNESS .100,MATERIAL REMOVED .050AND FOUND TO BE OUT OF LIMITS AIW B737-800 SRM 53-70-15-1A-1.REMOVED AND REPLACED INTERCOSTAL IAW B737-800 SRM 51-40-02 REF BAC DWG 147A5680 REV ATOOL# T8493F DUE 01-19-2023.