What was found
(CAN) INDICATION OF APU FIRE AT 35,000 FT. AFTER DISCHARGING BOTTLE AND SHUTTING DOWN APU, RED WARNING LIGHT EXTINGUISHED. CREW DIVERTED AND AC LANDED W/O INCIDENT. MAINT INSP FOR FIRE DAMAGE IAW SRM 51-4-10. FIRE CONTAINED BETWEEN BLKHD STA.1156 AND APU EXHAUST BAFFLE. NO EVIDENCE OF BURNED PRIMER OR DISCOLORED METAL. APU EGT AND TAIL PIPE FIRE DETECTION WIRING HARNESS FOUND BURNED, TAIL PIPE FIRE. APU TUB REMOVED AND INSP, NO LEAKS AND NO INDICATION OF FIRE DAMAGE. MAINT SUSPECT CAUSED OFFIRE AT EGT CONNECTORS TO WIRE HARNESS, FOUND BURNED. POSSIBLE SHORT OCCURRED, DAMAGED WIRING HARNESSES REPLACED AND APU FIRE DETECTION SYSTEM TESTED SERVICEABLE. APU FIRE BOTTLE REPLACED. AC RETURNED TO SERVICE.