As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TURNING ON BOTH PACKS SMOKE ODOR IN COCKPIT. ACFT PARKED AT GATE AFTER PACKS TURNED OFF SMOKE ODOR SUBSIDED. INSPECTED APU AND AIR CYCLE MACHINE ACM AREA, NO FAULTS FOUND. TESTED ACM TEST CONTROL SYSTEM, AIR SYSTEM CHECKS GOOD IAW AMM 21-51-00, NO SMOKE OR ODORS NOTED.