As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 4C-CHECK, MAINTENANCE FOUND THE FORWARD ''T'' INTERCOSTAL CORRODED UNDER THE PASSENGER DOOR THRESHOLD. MAINTENANCE FABRICATED A NEW INTERCOSTAL IAW ATR-42 SRM 53-67-70, AND INSTALLED IAW ATR-42 SRM 51-25-01. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)