As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:C3 MAIN CABIN FLOORBEAM HAS INTERGRANULAR CORROSION, LOWER SURFACE OF UPPER AFT FLANGE STA1700 RBL 20 TO 28. REPAIRED MAIN CABIN FLOORBEAM AT STA 1700 RBL 20 TO 28 IAW EA 008- 5310-01-A1369, EO DC8-5310-29405-AAND DWG 5755032.