As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(B757-53-3-6129) MAIN CABIN AFT FLOOR SUPPORT BOX BEAM BETWEEN STA 1660 AND STA 1680, RBL 57 UPPER SURFACE HAS CORROSION AT MULT IPLE AREAS. 209-059 REMOVED & REPLACED MAIN CABIN AFT FLOOR SUPPORT BOX BEAM BETWEEN STA 1660 TO 1680 RBL 57 IAW B757-200 SRM 51-40-02 PG 6 & 7.