What was found
(CAN) CREW REPORTED THAT ON APPROACH, THE APU FIRE INDICATION ILLUMINATED. THE CREW SHUTDOWN THE APU, FIRED THE EXTINGUISHER AND DECLARED AN EMERGENCY. ACFT LANDED WITHOUT FURTHER INCIDENT. ON THE GROUND, AFTER THE LANDING, THE APU FULL OF THE LENGTH OF THE MUFFLER INNER LINER WAS FOUND TORN AWAY FROM THE LT AT 180 DEGREES AND COLLAPSED TO THE RT SIDE. EGT PROBE WIRES INSULATION WERE ALSO FOUND MELTED OFF THE LAST INCH OF THE PAIR.