As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED JUST AFTER ROTATION, ENGINE NR 4 INDICATED FAN 5.0 VIBRATION. VIBRATION AUDIBLE AND VARIED WITH THRUST SETTING. PERFORMED BIRD STRIKE INSPECTION PER AMM 05-51-202-001. PERFORMED GAS PATH AND CHIP DETECTOR INSPECTION, NIL RESULTS. CHANGED DAMAGED FAN BLADES, OPERATION NORMAL PER AMM 72-31-02-004.