What was found
DFW INFLIGHT T1578/28APR - CREW REPORTED TAIL COMPARTMENT HIGH TEMPERATURE INDICATION. LIGHT FLICKERED ON AND OFF FOR THREE TO FOUR MINUTES BEFORE EXTINGUISHING. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. FOUND RIGHT PACK CLAMP ON BOOT LOOSE ON DUCT. FOUND P SEALS AT HEAT EXCHANGER LEAKING. REPLACED P SEALS. REPLACED CLAMPS AND REINSTALLED BOOT ON APU SURGE BLEED VALVE TEMPERATURE TABS IN AFT COMPARTMENT.