What was found
FLT NR 0655 - IAH - THE NR 2 ENGINE OVERHEAT LIGHT ILLUMINATED DURING CLIMB-OUT OF IAH. THE NR 2 ENGINE WAS SHUT DOWN AND THE RIGHT FIRE BOTTLE WAS DISCHARGED. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NO EVIDENCE OF FIRE. THE NR 2 ENGINE 'B' SYSTEM FIRE DETECTION CORE LOOP WAS FOUND AT FAULT. THE NR 2 ENGINE CORE LOOP WAS REPLACED. THE NR 2 ENGINE WAS RUN AND OPERATION OF THE FIRE DETECTION SYSTEM CHECKED NORMAL PER MM 26-21-00. THE RIGHT FIRE BOTTLE WAS REMOVED AND REPLACED. (M)