As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH ENG VIBE OUT OF LIMITS ON CLIMBOUT AT LEVEL OFF WE WERE UNABLE TO KEEP VIBE IN LIMITS, VIBE INCREASED WHEN POWER REDUCED, SHUT DOWN L ENGINE / REMOVED AND REPLACED LH ENGINE FAN BLADE RETAINING PINS IAW CRJ900 AMM 72-21-02-000/400-801. PERFORMED VIBE CHECK IAW CRJ900 AMM 71-00-00-720-806. VIBE CK GOOD.