What was found
(CAN) APU FIRE WARNING IN CRUISE, APU FIRE HANDLED & WARNING CEASED, BOTTLE DISCHARGED. AIRCRAFT CARRIED OUT A NORMAL LANDING. MAINTENANCE INSPECTED APU & AREA AND FOUND NO INDICATIONS OF FIRE OR OVERHEAT. THE AIRCRAFT WAS RELEASED UNDER THE PROVISIONS OF THE MEL. NEXT OVERNIGHT MAINTENANCE DISCOVERED DAMAGED WIRING AT THE TAIL PIPE FIRE LOOP. WIRING & LOOP WERE REPLACED ALONG WITH THE FIRE BOTTLE. THE SYSTEM TESTED SERVICEABLE AND THE AIRCRAFT RELEASED.