What was found
IAH - DURING C-CHECK INSPECTION, THE U-CHANNEL UNDER THE PASSENGER DOOR THRESHOLD WAS FOUND CORRODED. MAINTENANCE REMOVED AND REPLACED THE U-CHANNEL IAW ATR42 SRM 51-25-02, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. ACFT TT: 33,397 HOURS. CYCLES: 24,780. (X)