What was found
DURING C-4 CHECK INSPECTION, FOUND HEAVY CORROSION ON STRAP AND STRUCTURE FORWARD OF LONGERON 24 FORWARD ATTACH POINT BARREL NUT STA 850. REMOVED AND REPLACED STRAP AND STRUCTURE IAW DC-8 SRM 51-1-20D. C-4 CHECK CARD NR 3010, NON-ROUTINE TASK CARD NR 87585.