As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO PANEL FLOORBEAM CORRODED UNDER NUT PLATES. AFT CARGO STA 1390-1405, RBL 10 -- MKD. REMOVE CARGO FLOOR PANEL BEAM AT FACTORY SPLICE STA 1340-1440. DRILLED UP REPLACEMENT SECTION OF BEAM PER BAC DWG 146N5390 (882888). ALODINED REPLACEMENT BEAM PER BAC DWG 146N5390. TREATED AND PAINTED PER BAC DWG 146N5390 (492172). BEGAN INSTALLATION OF FLOORBEAM SUPPORT (492172). COMPLETED INSTALLATION PER B757 BAC DRAWING 146N5390.