As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FL 750 AT THE END OF CLIMB (FL350), CREW REPORTED THE RT ENGINE EXHIBITING LOUD NOISE VIBRATION. CREW REDUCED THRUST ON THE ENGINE, BUT THE VIBRATION CONTINUED. THE ENGINE WAS SECURED AND THE FLIGHT RETURNED TO CUN. (SET: 30 MINUTES.) MAINTENANCE ANALYSIS PENDING.