What was found
DURING AIRCRAFT N764CK C4-CHECK IN OSCODA MICHIGAN (OSC), KALITTA MAINTENANCE DISCOVERED CORROSION DAMAGE AT APPROXIMATELY STA 555 AND STA 610 ON THE OUTER CHORD OF THE FORWARD LOWER CARGO DOOR LOWER SILL. THE CORROSION WAS BLENDED IAW B767-300 SRM AND FOUND TO BE OUT OF LIMITS. FVCI WAS CONTACTED TO GENERATE A REPAIR EO (REF /A/) AND PROVIDE FAA FORM 8110-3 APPROVAL UPON COMPLETION. REPAIRED IAW ABX-REA-5330-65886-00 (REPAIR-FORWARD LOWER CARGO DOOR, LOWER SILL, OUTER CHORD, STA 555 & STA 610,AND FVCI EO 25166-1A