What was found
BWI - FLT 1924 - ABOUT 90 NAUTICAL MILES NORTH OF BWI, THE NR 1 ENGINE OVERHEAT ILLUMINATED. LIGHT WENT OUT WHEN THRUST WAS REDUCED TO IDLE. CREW DID NOT HAVE TO SHUT DOWN THE ENGINE. FLIGHT DIVERTED TO BWI AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE FOUND THE NR 1 ENGINE PRSOV LEAKING, AFT CORE FIRE DETECTION FAULTY, REPLACED SAME. (M)