As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(B737-53-3-0736) MAIN CABIN FLOOR BEAM STA 947 RBL48 CORRODED ON UPPER SURFACE. TRANSCRIBED FROM HAECO GSO NR 9280339. REPAIRED FLOORBEAM FROM LBL37 TO RBL60 AT STA 947.5 IAW B737-900 ER SRM 53-70-51-2R-5 REPAIR 5, THIS IS A CATEGORY "A" REPAIR. H AECO GSO MECH V900838 INSP QC453