As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:B-CK, FIRST BAY FWD OF MLG W/W JUST RT OF KEEL BEAM HAS R4 INTERCOSTAL CORRODED. REMOVED R4 INTERCOSTAL. FABRICATED NEW INTERCOSTAL FROM 2024-0 MAT AND HEAT TREATED TO T3 CONDITION IAW BAC 5602. HEAT TREATED VERIFIED. INSTALLED INTERCOSTAL PER SRM 53-1-0.