What was found
FUS LOWER AREA, UPPER WALL OF AIR CONDITIONING RAM AIR PLENUM AT LT PRIMARY HEAT EXCHANGER AREA WITH SIGNS OF CORROSION (RED MARKS). REMOVED FASTENERS FOR S/M ACCESS AS PER B727 SRM 51-30-2. REMOVED CORROSION AT RAM AIR PLENUM LT LOWER EXTERNAL SKIN AS PER B727 SRM 51-10-6. MATERIAL LOSS LOWER WING SKIN AREA STRINGER 5 ONE AREA 2 X 2 INCH .065 AND ONE AREA 1.5 X 2 INCH .06 FRD PER B727 SRM 57-30-1 AREA WITHIN 1.5 INCH OF SPANWISE SKIN SPLICES OUT OF SRM LIMIT. ACCOMPLISHED PENETRANT INSPECTION AND HFEC INSP LOWER WING SKIN NO CRACKS NOTED PER B727 NDT PART 6 51-00-00 MIL STD 6866B. REMOVED FASTENERS AT PANEL 3218 AND REMOVED ATTACH FITTING AT KEEL BEAM TO LOWER SKIN STA 5 LB 12 PLENUM AREA AS PER B72.