As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG OIL FUME SMELLS WHEN RUNNING LEFT PACK. DISCONTINUED USING LEFT PACK ++ PERFORMED PACK OPS CHECK IAW AMM 21-32-00 NO DEFECT WAS NOTED. RUN LEFT PACK FOR OVER 1 HOUR IN DIF TEMP SETTINGS. NO OIL OR UNUSUAL SMELL WAS NOTED. OPS CHECKED GOOD. SUSPECT BAD GROUND AIR CART AT DEPARTURE GATEWAY