What was found
MCN - MAJOR REPAIR - DURING C-18 CHECK A 2" CRACK WAS FOUND ON TORQUE BOX WEB AT BS 1138 L/H. MAINTENANCE CUTOUT DAMAGE AT TORQUE BOX WEB, FABRICATED A REPAIR DOUBLER, AND INSTALLED REPAIR IAW B737-200 SRM 51-40-2, PG. 1-3, FIG. 1, SRM 51-10-2, PG.7 & 32, FIG. 2, SRM 53-10-2, PG. 53, FIG. 6, AND SRM 51-30-02, PG. 2.