As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK A 4 INCH CRACK WAS FOUND ON THE KEEL BEAM AT LT AIR CONDITIONING ACCESS BAY BS 530. MAINTENANCE CUT OUT DAMAGED SECTION OF KEEL BEAM AND PERFORMED A HFEC INSPECTION TO VERIFY NO CRACKS EXIST. FABRICATED ANGLE, FILLERS, AND REPLACEMENT CLIP, AND INSTALLED REPAIR PARTS IAW AWA ER 03-5315-02151-TB3.