What was found
NR1 ENGINE VIBRATION, FLIGHT DIVERTED. WENT FROM 5.1 TO 8.0, ENGINE VIBRATION COULD BE FELT THROUGH OUT ACFT, FOLLOWED FM PROCEDURES AND LANDED AT NEAREST SUITABLE AIRPORT. IN DESCENT VIBRATION DECREASED TO 4.3 AT FL 240, AT FL 160 WITH ENGINES AT FLIGHT IDLE, VIB WENT TO ZERO. ALL CHIP DET'S CLEAN. ACP 'D VIBRATION SURVEY REF MM 71-00-00. MAX VIB WAS 1.2 ON THE N1 WITH NO SPIKES NOTED. OPS CHECKED ANTI-ICE VALVE. CHECKED OK. OK FOR SERVICE.