What was found
(CAN) IN CRUISE, FLT CREW REPORTED AN APU FIRE INDICATION. CREW FOLLOWED CHECKLISTS, DISCHARGED APU FIRE BOTTLE, DECLARED AN EMERGENCY & REQUESTED CLEARANCE DIRECTLY TO YWG. APU FIRE WARNING LIGHT REMAINED ON AND CREW ADVISED OF ABNORMAL LANDING CONFIGURATION. A/C LANDED WITHOUT INCIDENT, CFR CALLED OUT (NO FIRE INDICATION). AIRCRAFT TAXIED TO GATE. MAINTENANCE INSPECTION REVEALED NO FIRE INDICATION. APU & APU FIRE DETECTION SYSTEM MEL'D. AT NEXT RON, A/C INSPECTED & MAINTENANCE FOUND LT ELEVATOR PCU LEAKING HYD FLUID ONTO APU EXHAUST DUCTING. MAINTENANCE REPLACED PCU & GROUND CHECKED SERVICEABLE - NO LEAKS. APU FIRE DETECTION SYSTEM TESTED. NO FAULTS FOUND. A/C RETURNED TO SERVICE.