As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKEY OIL ODOR COMING THROUGH AIR VENTS. REMOVED AND CLEANED COOLESCER SOCKS WITH MILD DETERGENT. INSPECTED ALL DUCT WORK AND BORESCORED THE APU. RAN APU WITH TEMP CONTROLLER ON HOT & COLD. SHUT DOWN APU REPLACED COOLESCER SOCKS WITH NEW AND PACKING. OPS CHECKED GOOD.