What was found
(CAN) THE FLIGHT CREW REPORTED FUEL LEAKING FROM NR 1 ENGINE COWL DURING WALKAROUND. MAINTENANCE INVESTIGATION REVEALED THAT THE HYDROMECHANICAL FUEL CONTROL UNIT WAS LEAKING. THE FCU. WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE. TIME SINCE REPAIR ON THIS UNIT IS 5341 HOURS. A SUPPLEMENTAL REPORT WILL FOLLOW WHEN TEARDOWN RESULTS ARE RECEIVED.// 2000-11-03 TEARDOWN REVEALED EXTERNAL LEAKAGE WA FROM THE CUTOFF VALVE BORE VENT HOLE, AND ATTRIBUTED TO THE CUTOFF VALVE O-RING BEING SET. HONEYWELL REPORT #DB-2549 06 OCT/00.