As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO FIELD AND DECLARED AN EMERGENCY FOR SMOKE IN THE COCKPIT. PERFORMED OPERATIONAL CHECK OF THE AIR CONDITIONING PACKS AND BLEED AIR SYSTEMS WITH NO DISCREPANCIES NOTED. AIRCRAFT RETURNED TO SERVICE. (SW21200502002) (K)