As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EVENT SUMMARY STATES THAT 1888 IAD-CRW ON 626BR HAS DECLARED AN EMERGENCY AND RETURNED TO THE FIELD FOR MX. SMOKE IN THE CABIN. REMOVED AND REPLACED BOTH WATER SEPARATER COALESCER BAGS REF 21-51-13. PERFORMED GROUND RUNS. NO FURTHER DEFECTS NOTED REF 21-51-00.