What was found
DURING ROUTINE C CHECK INSPECTION, FOUND LEFT WING CENTER LEADING EDGE UPPER SURFACE INTERNAL DOUBLER CRACKED AT STATION XFS 422.750. REMOVED CRACKED INTERNAL DOUBLER. FABRICATED INTERNAL DOUBLER. CLEANED, TREATED, PRIMED AREA AND REPAIR PART. INSTALLED INTERNAL DOUBLER IAW DC8 SRM 51-1-21, SRM 51-1-20D, SRM 51-3-1, DC8 SRM 57-3-0 PAGE 28, AND DC8 SRM 51-1-8B.