What was found
BWI - FLT 378 - AT CRUISE, CAPTAIN RECEIVED AN ENGINE OVERHEAT/FIRE INDICATION ON THE NR 1 ENGINE. WITH POWER REDUCED TO ENGINE IDLE, THE INDICATION REMAINED. FLIGHT DIVERTED TO BWI. NO EMERGENCY WAS DECLARED AND THE NR 1 ENGINE WAS NOT SHUT DOWN. FLIGHT LANDED WITH NO FURTHER INCIDENT. MX REPLACED THE NR 1 ENGINE FIRE DETECTOR LOOP ASSEMBLY, THE FIRE/OVERHEAT CONTROL MODULE AND THE ENGINE/APU FIRE CONTROL PANEL. SYSTEM OPERATIONAL CHECKS AND TESTS NORMAL. RAN ENGINE, 'A' LOOP CHECKS NORMAL. FIRE DET LOOP ASSY P/N 6678, FIRE/OVERHEAT CONT MODULE P/N 6594-01, ENGINE/APU FIRE CONTROL PANEL P/N 69-37307-145. (M)