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 BAT FWD OF MLG W/W JUST RIGHT OF KEEL BEAM HAS R1 INTERCOSTAL CORRODED. REMOVED R1 INTERCOSTAL. FABRICATED NEW INTERCOSTAL FROM 2024-0 MAT AND HEAT TREATED TO T3 CONDITION IAW BAC-5602. HEAT TREAT VERIFIED BY CONDUCTIVITY. INSTALLED INTERCOSTAL PER SRM 53-1-0.