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-18 CHECK A 1 INCH CRACK WAS FOUND AT RT CENTER FLOORBEAM T-CAP ANGLE BS 540, BL-0. MAINTENANCE REMOVED CRACKED T-CAP ANGLE AT BS 540, BL-0; FABRICATED A NEW REPLACEMENT T-CAP ANGLE PER DWG 65-52894; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02 FIG 16 PG 1.