As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT CAPTAIN REPORTED SMOKE IN THE FLIGHT DECK WHEN THE NR 1 PACK WAS TURNED ON, DISCOVERY WAS MADE DURING ON-THE-GROUND AIRCRAFT COCKPIT PREFLIGHT. THE NR 1 PACK WAS FOUND TO BE AT FAULT. THE IMPELLER WAS RUBBING THE HOUSING CHAMBER, APPEARS BEARING MALFUNCTION. THE NR 1 PACK WAS R & R AND AIRCRAFT RETURNED TO SERVICE WITH NO ISSUES.