As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 722 EN ROUTE (PHL TO DUB). DURING CLIMBOUT FROM PHL THE RT ENGINE INDICATED VIBRATION OF 2.5 WITH SPIKES UP TO 2.8. THE FLIGHT RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED A FAN TRIM BALANCE. VIBRATION LEVELS WITHIN ACCEPTABLE LIMITS. (A)