As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ROTATION, BIRD STRIKE TO THE LT ENG. CREW HEARD LOUD NOISE & FELT AIRFRAME VIBRATION. LT ENG VIBRATION INDICATED OVER 4.5 & LT THRUST LEVER BEGAN REDUCING TO IDLE. LT ENG WAS SHUTDOWN & CREW PERFORMED AIR TURN BACK. PERFORMED BIRD STRIKE INSPECTION. REPLACE DAMAGED FAN BLADES IAW AMM. FOREIGN OBJECT DAMAGE, BIRD.