As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW, APPROXIMATLEY 22,700 EXCESSIVE ENGINE VIBRATION ON #2 ENGINE. FLIGHT CREW BROUGHT #2 THRUST LEVER TO IDLE ENGINE RAN SMOOTH, TRIED TO ADVANCE BACK TO CLIMB DETENT AND VIBRATION RESUMED. FLIGHT CREW KEPT #2 ENGINE AT IDLE FOR REMAINDER OF FLIGHT. THE AIRCRAFT LANDED A DFW SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED ENGINE VIBRATION SURVEY AND DETERMINED VIBRATION WAS WITHIN ACCEPTABLE LIMITS.