As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4917 EWR-YUL IS RETURNING TO EWR DUE TO POSSIBLE RIGHT ENGINE VIBRATIONS. ALL INDICATIONS ARE NORMAL AND NO EMERGENCY HAS BEEN DECLARED. EWR DID DECLARE AN EMERGENCY FOR OUR FLIGHT AND HAD FIRE TRUCKS ON STANDBY. THE AIRCRAFT WAS ABLE TO TAXI IN UNDER ITS OWN POWER.