What was found
ORD - FLT 1170 - EN ROUTE FLL-ORD, DURING CLIMB-OUT THROUGH 26,000 FEET, APPROXIMATELY 20 MINUTES INTO THE FLIGHT, TAIL COMPARTMENT HIGH TEMPERATURE LIGHT ILLUMINATED. LANDED ORD WITHOUT INCIDENT. TIGHTENED PRESSURE REGULATING VALVE CLAMPS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)