As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT DEPARTED WASHINGTON DULLES INTERNATIONAL AIRPORT ON FLIGHT 7187, THE FLIGHT CREW DETECTED A SEVERE VIBRATION AND RESULTANT ENGINE SHUTDOWN WITHOUT PILOT'S INPUT. THE AIRCRAFT RETURNED TO THE ORIGINATING AIRPORT AND DECLARED AN EMERGENCY. ENGINE CHANGED WAS INITIATED AND THE AIRCRAFT RETURNED TO SERVICE - GEARBOX SUSPECTED. AWAITING TEARDOWN REPORT. ENGINE INSTALLED (TSN 0.0; CSN 0)