As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN L FAN VIB IN YELLOW AT FL 340 L FAN VIB INDICATIONS WERE 2.1-2.3 OIL TEMP/PRESSURE NORMAL ENTIRE FLIGHT INITIAL DESCENT AT FL 340 VIB RANGED FROM 2.3-2.8 AT 16000 N1-67.9 L FAN VIB GREEN AT 1.7 AT 10000 N1 67.3 L FAN VIB-1.5 TURNED ON COWLS-NO ICE. PERFORMED FAN BLADE TANGS LUBE OF LEFT ENGINE IAW CRJ900 AMM 72-21-02, OPS TESTED GOOD, OK FOR SVC.