As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
N1 FAN VIBRATION IN THE YELLOW, NOT CONTROLLABLE, LEFT ENGINE SHUT DOWN. AFTER AC LANDED FOUND ICE ON SEVERAL FAN BLADES. RAN ENGINE FOR VIBE TEST , AC PASSED VIBE TEST . VIBE WAS BELOW 0.1. INSPECTED FWD AND AFT FAN NO DEFCTS NOTED REF TO CRJ700 AMM 30-22-01 AND 72-21-02