As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - C21 CK - C - BS 967 FLOORBEAM UPPER FLANGE CORRODED IN 4 PLACES BETWEEN LBL 22 AND RBL 49, BEYOND SRM LIMITS. MAINTENANCE REMOVED THE FLOORBEAM UPPER CAP AND FABRICATED AND INSTALLED NEW UPPER CAP IAW B737 SRM 53-10-9, FIG 2, PG 7 - 11.