As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(SUPPORT TASK) MAIN CABIN FLOOR STRUCTURE INTERCOSTAL AT STA 294 .5 - 312 LBL12 CORRODED. TRANSCRIBED FROM HAECO GSO NR 9282393 MECH V901143 CORROSION REMOVAL OF 0.050" FROM ORIGINAL 0.170", REMAINING 0.12 0" FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-10-51. REMOVED AND REPLACED INTERCOSTAL (P/N 141A5690-1) IAW BOEING DRAWING 141 A5600 REV N AND B737-800 SRM 51-40-02. TRANSCRIBED FROM HAECO.