What was found
(CAN) FLIGHT CREW REPORTED ON CLIMB OUT, FIRE WARNING BELL ACTIVATED AND NR 2 ENGINE FIRE HANDLE ILLUMINATED. EMERGENCY WAS DECLEARED - ENGINE FIRE BOTTLES BLOWN AND RETURN TO YYC REQUESTED. VISUAL INSPECTION OF ENGINE FOR SMOKE/FIRE BY FLIGHT ATTENENT RESULTED IN NO FAULTS FOUND. AIRCRAFT RETURNED FOR ABNORMAL LANDING WITH EMERGENCY VEHICLES ON STANDBY. NO ABNORMALITIES TO REPORT - AIRCRAFT TAXIED TO THE GATE. MAINTENANCE INSPECTION REVEALED NR 2 ENGINE LOWER FIRE LOOP - HARD FAULTED CORE TO SHELL SHORTED. FIRELOOP REPLACED PER MM 26-11-11, BOTH AFT/FWD ENGINE FIRE BOTTLES/SQUIBS REP LACED - SYSTEM TESTED SERVICEABLE PER MM 26-21-11.AIRCRAFT RETURNED TO SERVICE WITH NO FURTHER INCIDENTS TO REPORT.