As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2267 - DURING TAXI OUT, A BLUISH TINT SMOKE FILLED FLIGHT DECK AND CABIN AFTER APPROXIMATELY 20 MINUTES OF TAXI TIME. MAINTENANCE FOUND SMOKE CAME FROM NR 1 BLEED SYSTEM. REPLACED NR 1 ENGINE. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.