What was found
DURING M CHECK, ONE NUTPLATE ATTACH FASTENER HOLE IN THE ANGLE ABOVE LONGERON 18L WAS FOUND TO BE DAMAGED. THE SUBJECT HOLE WAS OPENED UP TOE .25 DIA IN ADDITION, CORROSION WAS BLENDED ON THE INBOARD FLANGE BELOW THE DAMAGED HOLE. REPAIRED PER EA 99-169241.