As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS FUMES IN FLIGHT DECK AT GATE. UPON ARRIVAL NO FUME SMELLED IN COCKPIT WITH NO CHANGE OTHER THAN APU ON/OFF. RAN APU WITH PACKS 1/2 IN VARIOUS CONFIGURATIONS. WPU ON AND PACKS ON/OFF TRIED TO LOCATE ANY CUPRIT OF FUMES NONE LOCATED. FLIGHT DECK CLEAR OF ANY UNNORMAL ODERS. OK FOR SERVICE