What was found
BOS - FLT 4380 - AFTER TAKEOFF CREW RECEIVED A FIRE WARNIGN ON RIGHT ENGINE. THE FIRE WARNING LIGHT ON CWP, MASTER WARNING AND 'T' HANDLE ALL ILLUMINATED BUT THERE WAS NO ORAL CHIME. CREW CLEARED MASTER WARNING AND ALL LIGHTS EXTINGUISHED. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED WEU AND AIRCRAFT TEST FLOWN WITH NO PROBLEMS ENCOUNTERED REF ODR PLGA970531A. (M)