As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE OR FUMES IN CABIN, SOURCE UNKNOWN CREW COMMENTS: RECIRC FANS WERE OFF HOT DUCT ODOR IN COCKPIT AND 1ST CLASS. RAN PACK FULL HOT FOR 20 MINUTE, ALL NORMAL. RAN RECIRCULATING FAN, ALL OK UNABLE TO DUPLICATE SMOKE OR FUMES WHILE A-C ON GROUND. ALL SYS OPERATE NORMAL SUSPECT FOOD BURNING. ACFT OK FOR SERVICE. NFF