What was found
NR 1 ENG OVERHEAT LIGHT CAME ON DURING CLIMBOUT - CHECK LIST ACCOMPLISHED - NR 1 ENGINE SHUTDOWN, RETURN TO DEPARTURE. TROUBLESHOOTING AND RECTIFICATION DETAILS. 2010-09-10 UPDATE: FAULT WAS FOUND TO BE NR 1 ENGINE PNEUMATIC SYS BLEED LEAK FROM PRESSURE REGULATING SHUTOFF VALVE (PRSOV). LEAKAGE FROM BUTTERFLY SHAFT END. PRSOV WAS REPLACED AND NO FURTHER ISSUES TO DATE. OPPOSITE ENGINE WAS ALO INSPECTED BUT FOUND OK. ISSUE CONSIDERED CLOSED BY OPERATOR.