As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL ODOR IN THE COCKPIT AND CABIN. ODOR IS STRONGER WHEN THE APU IS RUNNING. INSPECTED THE APU AND FOUND STARTER GEN PAD SEAL LEAKING. REPLACED WATER COALESCER SOCK. RAN BOTH ENGINES AND NO ODOR NOTED. PULLED AND COLLARED APU MASTER C/B.