As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING WALK AROUND NR 1 ENGINE WAS FOUND TO HAVE FAN BLADE DAMAGE. ACFT WAS REMOVED FROM SERVICE AND ALL THE FAN BLADES WERE REPLACED. FAN BLADE DAMAGE SUSPECTED TO HAVE OCCURRED DURING FLIGHT BUT NO OBSERVABLE OCCURRENCE REPORTED BY CREW. ACFT RETURNED TO SERVICE.