As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIC FLT 1673 - EN ROUTE RIC TO CLT. AT APPROXIMATELY FL190, THE FLIGHT EXPERIENCED EXTREME VIBRATION COMING FROM THE NUMBER ONE ENGINE. THE FLIGHT RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. UPON REACHING THE GATE, IT WAS REPORTED THAT PASSENGERS AND CABIN CREW NOTICED FLAMES COMING FROM THE REAR OF THE ENGINE. MAINTENANCE ACTION PENDING (OPEN).