As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FOUND OIL LEAKING FROM RT ENGINE INTAKE MANIFOLD PLENUM DRAIN. MAINTENANCE INVESTIGATION REVEALED OIL COMING FROM THE RT ENGINE DIFFERENTIAL PRESSURE CONTROLLER INTERNALLY LEAKING OIL INTO ENGINE INTAKE MANIFOLD. CONTROLLER REPLACED AND NO FURTHER LEAKS EVIDENT.