As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR DELAY PURPOSES. REFERENCE L/P 8449119 AIR RETURN FOR NR 2 ENG VIBRATION. CREW REPORTED NR 2 ENG VIBRATION BETWEEN 4 AND 5 ON THE VIBRATION GAUGE. NOTHING FELT ON THE THROTTLES BUT STARTED FEELING IN THE AIRCRAFT ITSELF. RETURNED TO CLEVELAND, NO EMERGENCY DECLARED AND ACFT WAS TAKEN OUT OF SERVICE WITH A 14:00 INFO FOR MAINTENANCE.