As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DECK AND CABIN HAS FOUL ODOR WITH APU ON. MAINTENACE FOUND THE FUEL FILTER HOUSING LEAKING FUEL WHICH WAS BEING INGESTED BY THE APU COMPRESSOR. AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED THE APU FUEL FILTER HOUSING IAW AMM 49-32-41-201 AND ACCOMPLISHED TASK CARDS 26L0021002 AND 26L21004.