What was found
MCN - MAJOR REPAIR - DURING C-12 CHECK A 1/2" CRACK WAS FOUND ON STRINGER 16 ON CABIN L/H SIDE AT BS 500C+16", JUST AFT OF LIGHT. MAINTENANCE REMOVED DAMAGED END OF STR 16, FABRICATED A REPAIR CHANNEL AND SHIM, AND INSTALLED REPAIR PARTS IAW AWA ER 03-5312-02092-SS4.