What was found
FLT 507 - ENGINE VIBRATION ON NR 1. VIBRATION METER AT 2 UNITS, ALL OTHER PARAMETERS NORMAL, THROTTLE ON NR 1 ENGINE WAS IMMEDIATELY REDUCED, WHERE NR 1 VIBRATION METER WENT OT 1 UNIT. AFTER PHONE PATH WITH FLIGHT CONTROL, THE FLIGHT WAS DIVERTED TO SJU. THE NR 1 ENGINE WAS LEFT AT IDLE FOR REMAINDER OF FLIGHT, WHICH LANDED NORMALLY IN SJU. ENGINE WILL BE REPLACED. (M)