As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M-CHECK, FOUND MAIN CABIN RT CUSP WEB IS CRACKED OVER FLOOR SUPPORT STA 579, ABOVE OTBD RIVET EXTENDING 1" FWD AND .2500" AFT OF SUPPORT. REMOVED FLOOR PANEL IAW SRM 51-30-1. REMOVED FLOOR SUPPORT IAW SRM 51-30-2. CUT OUT CRACKED SECTION OF WEB IAW SRM 51-10-2. HFEC INSP IAW NDT SPM 06-10-01. VERIFIED CRACK, REMOVED. FABRICATED REPAIR DOUBLER IAW DC9A-53-10-16-801-663A-A INSTALLED REPAIR DOUBLER AND FILLER IAW SRM 51-30-2.