What was found
SYR - FL 637 - FLT WAS CLIMBING OUT OF SYR AT 6,000 FT WHEN THE NR 1 ENGINE OVERHEAT LIGHT ILLUMINATED. CAPTAIN FOLLOWED EMERGENCY PROCEDURES AND DECLARED AN EMERGENCY. FLT RETURNED TO FIELD AT SYR AND LANDED W/O FURTHER INCIDENT. MX FOUND THE NR 1 ENGINE FUEL HEAT MANIFOLD ASSY HAD FAILED AND WAS LEAKING AT THE FUEL HEAT VALVE. REMOVED NR 1 ENGINE ASSY FOR ACCESS TO FUEL HEAT MANIFOLD ASSY. REMOVED AND REPLACED FUEL HEAT MANIFOLD ASSY. ALSO, REPLACED THE FUEL HEAT VLV (P/N 320115) DUE TO DAMAGE FROM MANIFOLD FAILURE. REINSTALLED NR 1 ENGINE ASSY PER JOB CARD. OPS CHECK AND LEAK CHECK GOOD. (M)