What was found
YWG - MAJOR REPAIR - DURING C-04 CHECK A CRACK WAS FOUND ON APU FIREWALL, RT SIDE (22WG), AT FIRE/OVERHEAT DETECTOR MOUNT BRACKET. MAINTENANCE REMOVED EXISTING CRACK ON LOWER FIREWALL SECTION AND BLENDED SHARP EDGES PER SRM CHAPTER 51 PROCEDURES, PERFORMED DVI TO VERIFY NO CRACKS EXIST. WELDED DAMAGED AREA, AND INSTALLED FILLER TO FILL VOIDS, BLENDED WELD TO ORIGINAL CONTOUR. ACCOMPLISHED REPAIR PER AWA ER 26-5350-02123-TB2.