What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK CORROSION WAS FOUND ON THE LOWER SURFACE OF HORIZONTAL WEB AT BS 988, RBL 45, WL 208 (AFT OF 986.5 FLOORBEAM AND INBOARD OF CREASE BEAM). MAINTENANCE REMOVED DAMAGED WEB, FABRICATED A NEW WEB, AND INSTALLED REPAIR IAW DWG 65C32677, B737-300 SRM 53-60-51 PG 101-104, FIG 104, SRM 51-20-01 PG 10 & 47 FIG 2, SRM 51-40-02 PG 10-11, SRM 51-40-05 PG 4 FIG 2 AND BMM 51-21-99 PG 701-703.