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-20 CHECK A 2 INCH CRACK WAS FOUND ON AFT CARGO DOOR HOLD OPEN FITTING SUPPORT (CHANNEL) BETWEEN FLOORBEAM BS 787 AND BS 807, RBL 20. MAINTENANCE REMOVED DAMAGED AFT CARGO DOOR HOLD OPEN FITTING CHANNEL FROM BS 787 TO BS 807, RBL 20; FABRICATED A NEW REPLACEMENT CHANNEL; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-05 FIG 2.