As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT N1 FAN VIBRATION AT 1.9 AT 33,000FT. REDUCED POWER AND UNABLE TO CONTROL VIBRATION. DESENDED 31,00FT. ABLE TO CONTROL FAN VIBRATION AT 1.5-1.7. NO ICE AND FLYING IN CLEAR WEATHER. VERIFIED DISCREPANCY. PERFORMED FAN BLADE TANG LUBRICATION ON LEFT ENGINE IAW CRJ900 AMM 72-21-12. PERFORMED HIGH PERFORMANCE ENG RUN. OPS CHECK GOOD AT THIS TIME. OK FOR SERVICE.