As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED A STRONG PETROLEUM ODOR THROUGH VENTILATION SYSTEM OF PACK 1 , NOTICED UPON INITIAL DECENT WHEN POWER PULLED TO IDLE NOTED MULTIPLE TIMES. MX PERFORMED COOLING PACK SYSTEM OPS CHECK (PACK #1) IAW AMM 21-51-00 OPS CHECK GOOD COULD NOT DUPLICATE PROBLEM. A/C WAS APPROVED FOR RETURN TO SERVICE.