As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MX TEST FLIGHT, AFTER REPLACEMENT OF BLOWER AND ALTERNATOR ON SUSPECT LEAKING RT ENG GEARBOX. (2) HOURS OUT, RT ENGINE GEARBOX LOW OIL PRESSURE WARNING LIGHT. ACFT WAS DIRECTED TO RETURN TO DEPARTURE. PROP WAS FEATHERED AND ENGINE WAS SHUTDOWN. NO PASSENGERS ON TEST FLIGHT.