What was found
AT FL 310 LOWER AFT BODY OVERHEAT LIGHT STARTED TO BLINK THEN STAYED ON UNTIL RED TAB WAS COMPLIED WITH, UPON CLOSING NR 3 BLEED, LIGHT WENT OUT. CONTINUED FLT. USING NR 2 BLEED SUPPLYING RIGHT PACK WITH NO FURTHER OVERHEAT INDICATION. INSPECTED AFT AIRSTAIR AREA DUCTS FOR SECURITY TOOK A/C OUT TO RUN-UP AREA RAN TO 1.80 EPR PERFORMED LEAK CHECK OF BLEED DUCTS NO LEAKS NOTED RAN AT POWER. NO FAULTS OCCURRED CHECKED HISTORY AND NO HISTORY IN LAST 90 DAYS FOUND SYSTEM TO BE OPERATING NORMAL OK FOR FLIGHT.