As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2246 - FLIGHT ATTENDANT AND FIRST OFFICER REPORTED SMOKE AND HAZE IN THE COCKPIT AND CABIN. MAINTENANCE INSPECTED THE AIRCRAFT AND GROUND RAN BOTH ENGINES. BOTH ENGINES WERE RAN SEPARATELY AND AT VARIOUS POWER SETTINGS WITH THE BLEEDS OPERATING. COULD NOT DUPLICATE WRITEUP. AIRCRAFT RETURNED TO SERVICE. NO PARTS WERE REPLACED.