As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES IN CABIN & COCKPIT. RTFL. REPLACED AIR RECIRCULATION FAN FILTERS AND OZONE CONVERTERS RUN PACKS. NO FUMES NOTED. FURTHER TROUBLESHOOTING FOUND APU PNEUMATIC DUCT CONTAMINATED WITH OIL CAUSING FUMES IN CABIN/COCKPIT. NEED NEW APU. REPLACED APU. PERFORMED DUCT & PACK BURNOUT AFTER APU REPLACEMENT. VERIFICATION FLIGHT CONFIRMED FUNCTIONALITY OF APU. ACFT OK FOR SERVICE.