What was found
DFW - (REPEAT ITEM) CREW REPORTED TAIL COMPARTMENT HIGH TEMPERATURE LIGHT ILLUMINATED. QRH PROCEDURES WERE ACCOMPLISHED AND LIGHT WENT OUT AFTER TWO MINUTES AND DID NOT ILLUMINATE AGAIN. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED GASKET ON LEFT AIR CYCLE MACHINE PACT TEMP THAT WAS DAMAGED. REPLACED PNEUMATIC CROSS FEED VALVE THAT WAS LEAKING. STSTEM GROUND CHECK NORMAL OPERATION.