What was found
ON FLIGHT 3604 DURING CLIMB OUT CREW REPORTED N1 FAN VIBRATION PEAKED AT 1.7 WITH THRUST LEVERS IN CLIMB DETENT. WHEN LEVEL AT FL340 N1 FAN VIBRATION EXCEEDED GREEN LIMITS & PEAKED AT 2.0 WITH THRUST LEVERS IN CRZ SETTING. THE VIBRATION FAULT THROUGH ENTIRE ACFT AS REPORTED BY FLIGHT ATTENDANT`S & DECLARED EMERGENCY. THE ACFT WAS REMOVED FROM SERVICE. COMPLIED WITH PSR NR-2013-12-05 507-0002 PSR ITEM 1. PN 4120T78P02 & SN VBR00092.