As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T2020/29MAY. FLIGHT ATTENDANTS REPORTED ENGINE VIBRATIONS IN AFT CABIN. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. VISUAL INSPECTION REVEALED BIRD INGESTION TO NR ONE ENGINE. REPLACED THREE PAIR FAN BLADES. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)