What was found
FLT#109, BOS-JAX (AIRCRAFT DIVERT TO SAV). 'N2 VIBRATION DURING HOLD AT 14000, AGAIN TWICE AT LOWER ALTITUDES. TRIGGERED EACH TIME N1 WENT ABOVE 70 %. N2 VIBRATION MSG WOULD DISAPPEAR WHEN N1 WAS BELOW 65-70%, ALLOWING NORMAL OPERATION AT LOWER POWER SETTINGS; IN REFERENCE TO MDDR 467816 #2 ENGINE VIBE CONDITION BEING MONITORED PER EMM 72-00-00-168-OB5A-A. LIMITS ARE 1.1 TO 1.3. A/C OK TO CONTINUE SERVICE VALUES REPORTED BY CREW 1.03 TO 1.16.'