What was found
(CAN) PER THE CREW DURING THE CRUISE PHASE AT 11,000FT CREW RECEIVED A APU FIRE INDICATION MESSAGE. CREW THEN CONSULTED THE QRH, DEPLOYED THE FIRE BOTTLE, DECLARED EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. UPON LANDING FIRE DEPARTMENT MET CREW AT A/C AND CONFIRMED NO FIRE DAMAGE. CUSTOMER MAINTENANCE IS SUPPORTING AND FOUND APU FIRE WALL & APU MOUNTS WERE NOT SEALED - FIRE BOTTLE REPLACED AND SEALANT APPLIED TO APU FIREWALL (TC# 20191216013)