As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. STRONG OILY SMELL ODOR THROUGHOUT CABIN & COCKPIT. FOUND THE APU, OIL PRESS SENDING UNIT O RING LEAKING OIL WHICH WAS REPLACED & A SATISFACTORY LEAK & OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS BEING NOTED. SEE AALA201601139007 & AALA201601139008 FOR ADDITIONAL INFORMATION.