What was found
ORD - FLT 2099 - EN ROUTE ORD-MCO, TAIL COMPARTMENT TEMPERATURE HIGH RED CAME ON AT 25,000 FEET. DURING CLIMB LIGHT EXTINGUISHED 20 SECONDS AFTER RED BOX PROCEDURES COMPLIED WITH. LIGHT CAME BACK ON IN 1 MINUTE AND WAS ON FOR ABOUT 2 MINUTES BEFORE EXTINGUISHING FOR REMINDER OF FLIGHT. RETURNED ORD AND LANDED WITHOUT INCIDENT. REPLACED RIGHT PACK TRIM DUCT COUPLING. LEAK CHECKS GOOD. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)