What was found
NR 1 PYLON OTBD AFT 311N5046-31 SKIN PANEL ASSY HAS CORROSION ON INNER SURFACE. REMOVED AND INSTALLED STRIKER PLATE AND MOUNT FITTING IAW SRM 51-40-02 AND DWG 311N5108. REMOVED AND INSTALLED HEAT SHIELD IAW SRM 51-40-02. REMOVED AND INSTALLED FWD FAIRING IAW SRM 51-40-02. REMOVED OTBD AFT SKIN IAW SRM 51-40-02. RECEIVED NEW SKIN ON SERVICABLE TAG NR 4541B3 LOCATED AND DRILLED NEW SKIN AND INSTALLED SKIN IAW SRM 51-40-02 AND DWG 311N5002. CAT A MAJOR REPAIR. NO FOLLOW UP INSP REQUIRED.