What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK EXFOLIATION CORROSION WAS FOUND ON INNER CHORD AT NUT PLATE HOLES OF UPPER AND LOWER SURFACE FROM BS 306 TO BS 328, ON LOWER SURFACE CORROSION WAS FOUND TO BE ON THE INNER CHORD STIFFENER (ANGLE). MAINTENANCE REMOVED CORRODED STIFFENER AND INNER CHORD FROM BS 277 TO BS 360, FABRICATED A NEW STIFFENER AND INNER CHORD AND INSTALLED REPAIR PARTS IAW B737-300 SRM 51-40-02, PG 3, 4, & 10.