What was found
IAH - DURING C-CHECK INSPECTION, THE SERVICE DOOR THRESHOLD CHORD WAS FOUND CORRODED FROM FRAME 38 TO FRAME 39. MAINTENANCE REMOVED AND REPLACED THE AFECTED CHORD IAW ATR 42-320 SRM 51-21-42, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. AIRCRAFT TT: 22,917.4 HOURS. CYCLES: 24,865. (X)