What was found
(CAN) NR 1 ENGINE FIRE WARNING LIGHT INDICATION ILLUMINATED, TOP OF DESCENT INTO YYC. CREW SHUT DOWN NR 1 ENGINE, DISCHARGED FIRE BOTTLE AND CARRIED OUT A SINGLE ENGINE LANDING. FIRE WARNING SYSTEM INSPECTED, NR 1 ENGINE LOWER FIRE DETECTION LOOP, 4 CONNECTORS AND FIRE BOTTLE REPLACED.