What was found
"DURING AIRCRAFT N764CK C4-CHECK IN OSCODA MICHIGAN (OSC), KALITTA MAINTENANCE DISCOVERED FUSELAGE SKIN CORROSION UNDER STRINGER S-38L AT STA 1395 WHILE PERFORMING A STRINGER SPLICE. THE CORROSION WAS BLENDED IAW B767-300 SRM AND FOUND TO BE OUT OF LIMITS AND NO APPLICABLE REPAIR WAS IDENTIFIED WITHIN THE SRM. FVCI WAS CONTACTED TO GENERATE A REPAIR EO (REF /A/) AND PROVIDE FAA FORM 8110-3 APPROVAL UPON COMPLETION. THE PURPOSE OF THIS REA IS TO AUTHORIZE AND DOCUMENT ACCOMPLISHMENT OF REF /A/. FUSELAGE SKIN BETWEEN STA 132.5-1843 IS CONSIDERED FCBS STRUCTURE PER B767-300 SRM 51-00-04 TABLE 1. THIS REPAIR IS CONSIDERED MAJOR AND WILL REQUIRE FAA FORM 8110-3 APPROVAL. REPAIRED IAW ABX-REA-5360-65895-00_0001 AND FVCI EO 25166-2A"