As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA-ON FLIGHT NUMBER 2255, CABIN FILLED WITH SMOKE DURING TAXI AFTER COMPLYING WITH BETA LOCKOUT RESET PROCEDURES. GROUND RAN ENGINES WITH BLEED AIR AT SEVERAL POWER SETTINGS. NO EVIDENCE OF SMOKE IN FLIGHT COMPARTMENT OR CABIN. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.