As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT 2045 RETURN TO FIELD FOR TORQUE SPLIT AND/OR FUEL FLOW SPLIT EN ROUTE TO PDT. ON RETURN TO SEA ON APPROACH AT 5,000 FEET CABIN AND COCKPIT FILLED WITH SMOKE. CAPTAIN DECLARED EMERGENCY BUT LANDED WITHOUT INCIDENT. REPLACED NR 1 ENGINE. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.