As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AFTER TAKEOFF, PILOT NOTICED OIL COMING OUT OF THE RIGHT ENGINE COWL AND RETURNED TO THE AIRPORT. OIL WAS FOUND COMING FROM THE STARTER DRIVE ADAPTER DAMPER. ENGINE WAS REMOVED AND SENT TO OVERHAUL FACILITY. ON TEAR-DOWN THE ADAPTER BEARING WAS FOUND TO HAVE FAILED. THIS IS AN INTERNAL ENGINE COMPONENT.