What was found
EN ROUTE FROM BOS-BWI, THE REAR BAY OVERHEAT LIGHT ILLUMINATED. ENGINE POWER WAS REDUCED AND THE LIGHT EXTINGUISHED. POWER WAS REAPPLIED AND THE LIGHT DID NOT ILLUMINATE. THE AIRCRAFT DIVERTED TO OXC AS A PRECAUTION AND LANDED WITHOUT INCIDENT. THE AIRCRAFT REAR BAY WAS INSPECTED WITH NO DAMAGE FOUND. A GROUND RUN OF THE AIRCRAFT WAS PERFORMED. THE REAR BAY LIGHT DID NOT ILLUMINATE, BUT A SMALL LEAK WAS DETECTED FROM THE FLOW CONTROL VALVE. THERE IS A HEAT DETECTOR IN CLOSE PROXIMITY TO THE VALVE. OPS CHECKED REAR EQUIPMENT BAY HEAT DETECTORS IAW MM 26-10 TEST B CHECKED GOOD. THE VALVE SEALS WERE CHANGED, THE AIRCRAFT WAS RUN AT HIGH POWER WITH ALL SYSTEMS NORMAL AND NO LEAKS. THE AIRCRAFT WAS RETURNED