As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:C4, FUSELAGE FLOOR STRUCTURE, FLOOR BOARD SUPPORT AT LBL 41 TO 56 AT STA 1057 AFT UPPER FLANGE CORRODED. BLENDED CORROSION ON FLOOR SUPPORT. FOUND TO BE OUT OF LIMITS. 0.060" OF ORIGINAL THICKNESS OF 0.0080. REMOVED PART. RECEIVED EXTRUSION BAC 1505-100590. RECEIVED REPLACEMENT PART. TREATED ALODINED, PRIME AND INSTALLED IAW SRM 53-00-51-1AI IAW SRM 51-40-02-OG IAW SRM 51-40-02-0G.