As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIH- ON FLIGHT 2187 AFTER ENGINE START WHEN BLEEDS WERE SELECTED ON FLIGHT ATTENDANT NOTICED BLUE/GRAY SMOKE COMING FROM FLOOR VENTS. SMOKE STOPPED AFTER A MINUTE OR TWO. GROUND RAN NR 1 AND NR 2 ENGINES WITH BLEEDS ON. NO NOTICABLE SMOKE. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.