What was found
LT WING TOP SKIN SURFACE IS CORRODED AT THE REAR SPAR AREA FROM RIB 4 - RIB 5. REMOVED 2 EA FASTENERS LT WING TOP SKIN UPPER SURFACE REAR SPAR BETWEEN RIB 17 AND RIB 18 IAW SRM 51-40-21. BLENDED CORROSION IAW SRM 51-74-10. FOUND TO BE WITHIN LIMITS IAW SRM 57-20-12, PGS 13 & 110. FLAP PEENED AREA IAW SRM 51-29-00, PG 201. ALODINED, PRIMED AND PAINTED AREA IAW SRM 51-21-10, PG 3; SRM 51-73-10, PG 203 & SRM 51-23-00, PG 24. INSTALLED 2 EA FASTENERS IAW SRM 51-40-21.