What was found
DURING CLIMBOUT OF DTW, THE TAIL COMPARTMENT TEMPERATURE ANNUNCIATOR AND MASTER WARNING LIGHT ILLUMINATED. REDUCED POWER AND WENT TO HP BLEED OFF ON PACKS AND LIGHTS WENT OUT. RESUMED POWER AND MASTER WARNING CAME ON MOMENTARILY AFTER ABOUT 5 MINUTES. RETURNED TO DTW AND LANDED WITHOUT INCIDENT. FOUND RIGHT AC TEMPERATURE HIGH SENSOR GASKET DETERIORATED. REPLACED GASKET AND PERFORMED LEAK CHECK DURING DUAL ENGINE RUN. OPERATIONAL CHECK OK.