What was found
DURING C-4 CHECK INSPECTION, FOUND FS 1690 LONGERON 23 RIGHT SURFACE CORROSION ON SKIN. REMOVED DAMAGED SKIN, INSTALLED REPAIR IAW EA 96-326, AIA SKETCH AIA/E/2394, AND AIA 8110-3 DATED 11-15-96. C-4 CHECK WORK CARD NR 3014, NON-ROUTINE TASK CARD NR 87265.