What was found
FLT NR: ATN 820/KDFW TO KIAH. DURING CRUISE FROM KDFW TO KIAH THE NR 3 FIRE WARNING CAME ON. THE CREW ACCOMPLISHED THE APPROPRIATE CHECK LIST AND DISCHARGED BOTH FIRE BOTTLES, AND CONTINUED TO KIAH AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LT FAN, RT CORE, PYLON FIRE SENSING ELEMENT, LT CORE CONNECTOR, AND BOTH FIRE BOTTLES. OPERATIONAL CHECK GOOD IAW MM 26-11-16, 26-11-15 AND 26-21-09. AIRCRAFT WAS RETURNED TO SERVICE. (A)