As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAN VIBRATION ON LEFT ENGINE WENT TO 5.0 ON INITIAL CLIMB-OUT 4.2-4.5 IN CRUISE AT FL 310/330/350. COULD FEEL VIBS ONLY AT IDLE OR LOW PWR SETTINGS. REMOVED AND LUBED FAN BLADES PER MM. LUBED PER OPN 4021. PERFORMED ENG VIB SURVEY WITH PBS 4000 IN ACCORD WITH PREFLIGHT HANDBOOK TEST NBR 7. VIBS WITHIN ALLOWABLE LIMITS.