What was found
(CAN) DURING CLIMB THERE WAS A ZONE 1 FIRE INDICATION ON THE NR 1 ENGINE THE THROTTLE WAS RETARDED TO 2 20 INCH INDICATION STOPPED BUT REAPPEARED THE ENGINE WAS SHUT DOWN AND THE PROP WAS FEATHERED. THE AIRCRAFT RETURNED TO BASE. UPON INVESTIGATION BY MAINTENANCE STAFF THE EXHAUST STACK AT POSITION NR 9 WAS FOUND SPLIT, THE HEAT HAD CAUSED THE FIRE WIRE WAS BURNED THROUGH CAUSING THE FIRE INDICATION. THE EXHAUST STACK WAS REPLACED AS WELL AS THE FIRE WIRE. THE AIRCRAFT WAS INSPECTED FOR OTHER DAMAGE. FOUND SERVICEABLE. THE AIRCRAFT WAS RETURNED TO SERVICE. TOTAL TIME ON EXHAUST STACK IS UNKNOWN.