As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DESCENT 7000 FEET AND GATE ARRIVAL AUXILIARY POWER UNIT AIR ON, VERY STRONG FUMES OF FUEL IN COCKPIT AND AFT CABIN. ACCOMPLISHED CARD 26L00021001 SMOKE ODOR INITIAL FUMES TROUBLE SHOOTING. REMOVED AND REPLACED FILTERS PER AMM 21-21-41 NO ODOR NOTICED AT THIS TIME.