What was found
MCN - MAJOR REPAIR - DURING C-12 CHECK A 1/4" CRACK WAS FOUND ON LOWER SURFACE L/H WING CLOSE OUT WEB SUPPORT ANGLE 33" OUTBOARD OF THE INBOARD END OF AILERON, WS 538. MAINTENANCE REMOVED THE DAMAGED ANGLE FROM CLOSE OUT WEB WS 538, FABRICATED A NEW REPLACEMENT ANGLE, AND INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, PG. 10.