What was found
AIRCRAFT WAS GROUNDED. DFW-IAD RETURNED DFW ACCOUNT TAIL COMPARTMENT HIGH TEMPERATURE LIGHT ILLUMINATED. EMERGENCY DECLARED. LANDED OVERWEIGHT WITHOUT INCIDENT. AT 2500 FEET TAIL COMPARTMENT HIGH LIGHT FLASHED ON 2-3 TIMES. MAINTENANCE ACCOMPLISHED MCM CARDS 0930 SUMMER PREP, 26-96-11 TAIL COMPARTMENT TEMPERATURE HIGH LIGHT AND 36-95-15 TAIL COMPARTMENT LEAKS. REPAIRED ALL LEAKS FOUND AND REPLACED ALL WORN PARTS. ACCOMPLISHED FUNCTIONAL CHECK FLIGHT, FAILED CHECK FLIGHT. MAINTENANCE REPLACED LT AND RT TAIL COMPARTMENT OVERHEAT SENSORS IAW AMM 36-20-02. OPS CHECKED GOOD. ACCOMPLISHED ANOTHER FUNCTIONAL CHECK FLIGHT, PASSED CHECK FLIGHT.