What was found
DURING ROUTINE C-CHECK INSP, FOUND NR 4 STUB WING L/E EXTERNAL SKIN CORRODED. REMOVED CORROSION. FOUND OUT OF LIMITS. REMOVED DAMAGED AREA. PERFORMED NDT INSPECTION. NO DISCREPANCY FOUND. FABRICATED NEW SKIN, REPAIR DOUBLER AND FILLER. CLEANED, TREATED, PRIMED AREA AND REPAIR PARTS. INSTALLED REPAIR PARTS IAW FAA FORM 8110-3, DATED 04/22/11, DWG ED-5356 DATED 04/06/11, SRM 51-1-8, SRM 57-2-0, NDT SPM PART 06-10-01-001, DWG ED-5356, DPS 4.710 REV "L", SRM 51-1-4, DPS 3.69-4 REV "AP", SRM 51-1-8B, SRM 51-1-21, SRM 51-1-20D, AND SRM 51-3-1.