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 DUE TO: HIGH ENGINE VIBRATION INDICATION ON NUMBER 2 ENGINE. AIRCRAFT RETURN TO AND LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. REPLACED (FFCC) FAN FRAME COMPRESSOR CASE VIBRATION, PER AMM 77-31-04.