What was found
MCN - MAJOR REPAIR - DURING C-18 CHECK EXFOLIATION CORROSION WAS FOUND ON FLOORBEAM AT FASTENER HOLE BS 344, RBL 7. MAINTENANCE REMOVED DAMAGED SECTION OF FLOORBEAM CHORD; FABRICATED A NEW REPLACEMENT SECTION OF CHORD, 2 EACH REPAIR ANGLES, & 3 EACH WEB STIFFENERS; INSTALLED REPAIR PARTS IAW B737-300 SRM 53-10-51, FIG 205, PG 221-223.