What was found
TAIL COMPARTMENT TEMPERATURE HIGH AND MASTER WARNING LIGHTS ILLUMINATED DURING CLIMBOUT FROM RDU. LIGHTS STAYED ON FOR APPROXIMATELY THREE SECONDS THEN EXTINGUISHED. AFTER A FEW MINUTES, AGENT 2 LOW LIGHT ILLUMINATED AND REMAINED ON. FLIGHT CONTINUED TO DESTINATION (DTW) AND LANDED WITHOUT INCIDENT. FOUND LEFT ACM DUCT BLOWN AND NR 2 FIRE AGENT BOTTLE HAD DISCHARGED. REPLACED DUCT AND NR 2 FIRE AGENT BOTTLE. AIRCRAFT RETURNED TO SERVICE.