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 BEAM STA 380 HAS BARE METAL ON U PPER FWD SURFACE AT LBL 56. TRANSCRIBED FROM HAECO GSO NRC# 928 0408. UPON FURTHER EVALUATION, FOUND BARE METAL AREA TO BE CORRODED. REMOVED .025" CORRODED MATERIAL FROM ORIGINAL .125" MATERIAL THIC KNESS IAW B737-900 SRM 51-10-02. REPAIRED CORRODED AREA OF STA 3 80 FLOORBEAM IAW UAL ECRA 5335-01164 REV A.