As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
B757-53-3-0480 MAIN AFT CABIN FLOOR SUPPORT BOX BEAM HAS CORROSION BETWEEN BS 1660 AND BS 1681, LBL 58,209-108. REMOVED AND REPLACED FLOOR SUPPORT BOX BEAM P/N 146N5246US, PO N O. SAG1722589 AT MAIN AFT CABIN BTW BS1660 AND BS1681 AND LBL 58 . IAW B757-200 SRM 51-41-02 AND DWG 146N5230