What was found
DURING APPROACH TO ANC NR 4 ENG ZONE 1 FIRE WARNING LIGHTS ILLUMINATED AND BELL SOUNDED. SHUTDOWN ENG WITH EMERGENCY HANDLE AND DISCHARGED FIRE BOTTLE. TRANSFERRED TO NR 3 FIRE BOTTLE AND DISCHARGED. LIGHTS AND BELL REMAINED ON. LANDED AT ANC WITHOUT FURTHER INCIDENT. INSPECTED NR 4 ENGINE ZONE 1 FOR EVIDENCE OF FIRE, NONE NOTED. FOUND ZONE 1 SENSING ELEMENT SHORTED. CHANGED ZONE 1 SENSING ELEMENT, NR 3 AND 4 FIRE BOTTLES. SYSTEM OPS CHECKS NORMAL.