As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW HAD VIBRATION INDICATIONS FROM THE RIGHT ENGINE. THE CREW ALSO REPORTED AIRFRAME VIBRATION. FLIGHT RETURNED TO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE RIGHT ENGINE NR 1 FAN BLADE SET (24 TOTAL). DAMAGE DUE TO GROUND INGESTION OF SNOW/SLUSH PRIOR TO TAKEOFF.