As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRIP NR 1129042 CREW NOTED A SMOKE ODOR IN THE CABIN DURING PRE-LANDING ENVIRONMENTAL SYSTEM CHECK. ODOR WENT AWAY AFTER HEAT WAS TURNED DOWN. MAINTENANCE PERFORMED SEVERAL GROUND RUNS AND WAS UNABLE TO DUPLICATE THE DISCREPANCY. AIRCRAFT WAS RELEASED AND HAS NOT DISPLAYED THIS ISSUE IN SUBSEQUENT FLIGHTS.