What was found
RT WING NR9 L/E SLAT, OTBD AREA, CORROSION RUNS UNDER BOTH FASTENERS. ACCOMPLISHED EA F-5740-141230; WING L/E SLAT NR9, NOSE SKIN CORROSION REPAIR. REF. FAA FORM 8100-9, DATED 11/12/2010. REPAIR ACCOMPLISHED ON SLAT ASSY. PN; 141N4003- 174, SN; A2-0122. CORROSION WAS OUT OF LIMITS IAW SRM 57-43-01, FIG 101, DETAIL 6; L=3",W=2",D=.021"CAT. "A" MAJOR REPAIR.