As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT 5803, L/P 1517728) CORROSION SECOND TIER IN REF. NRC S/N 00435: CORROSION ON GUTTER SUPPORT FROM STA 1661 TO STA 1681 BTW LBL 54 AT PASSENGER CABIN. CORRECTIVE ACTION: REPLACED PER B757-300 SRM 51-40-02 PAR 7 AND DWG 146N5230 REV. A.