What was found
DURING SCHEDULED MAINTENANCE IN MCN, CORROSION WAS DISCOVERED AT FRAME 23, STRINGERS 20 LEFT TO 19 RIGHT. MAINTENANCE REPAIRED AIRCRAFT IAW ASA EO 120-53-0165. THIS EO CONTAINS REPAIR SPECIFICATIONS FOR CORROSION REPAIR AT FRAME 23, STRINGERS 20 LEFT TO 19 RIGHT. AIRCRAFT RETURNED TO SERVICE. (M)