As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REDUCED RH ENGINE POWER AFTER OIL PSI LOW WARNING ANNUNCIATOR ALERTED. PILOT RETURNED TO DEPARTURE AIRPORT, LANDED WITHOUT INCIDENT, AND SHUTDOWN ENGINE WHEN CLEAR OF THE RUNWAY. MAINTENANCE FOUND LEAKING OIL SEAL AT PROP SHAFT AND REPLACED THE SEAL.