As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ODOR PREVALENT IN CABIN FROM ENVIRONMENTAL SYSTEM. MOST NOTICEABLE WITH APU BLEED ON. DISSIPATES SOMEWHAT WITH ENGINE BLEED SOURCE. FOUND OIL LEAKS FROM THE APU FAN OIL COOLING AND THE APU OIL COOLER. MAINTENANCE REPLACED THE APU FAN OIL COOLING PER AMM 49-52-51 AND REPLACED THE APU OIL COOLER PER AMM 49-91-44. A SATISFACTORY LEAK AND OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS BEING NOTED.