What was found
GYR - DURING C12 CHECK DISCOVERED CORROSION, LEVEL 2 INTERGRANULAR, ON L3 DOOR EMERGENCY LOWER WEB FROM BS 1340 TO BS 1360 AT STR 17L. MAINTENANCE REMOVED CORROSION FROM LOWER WEB FROM BS 1340 TO BS 1360 AT STR 176 IAW BOEING 757-200 SRM 51-10-02. CORROSION FOUND OUT OF LIMITS IAW BOEING 757-200 SRM 53-60-15-1A 1. REMOVED THRESHOLD WEB FROM BS 1340 TO BS 1360 AT STR 17L IAW BOEING 757-200 SRM 51-40-02. INSTALLED FABRICATED THRESHOLD WEB FROM BS 1340 TO BS 1360 AT STR 17L IAW BOEING 757-200 SRM 51-40-02.