As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AGEING ACFT, ACFT INSPECTION FLOORBEAM BS 1640, LBL 10 TO RT FRAME UPPER CHORD, LOWER SURFACE OF FLOORBEAM HAS MANY AREAS OF CORROSION AROUND NUTPLATE HOLES, REF N01875. FLOORBEAM AT STATION 1640 LBL 70 TO RBL 70 WAS R & R WITH NEW FABRICATED FLOORBEAM IAW DWG 146N5136 SHT 1 REV & 146N5089 SHT 6 REV. REPAIR CLASSIFIED AS MAJOR.