What was found
JUST PRIOR TO A POST MAINTENANCE ROC CHECK FLIGHT, THE ENGINE OIL TANK CAP AND OIL LEVEL WAS VERIFIED BEFORE FLIGHT. DURING THE FLIGHT, THE ENGINE OIL PRESSURE LIGHT ILLUMINATED. THE PILOT RETURNED TO THE BASE/AIRPORT. UPON A POST INSPECTION, THERE WAS NO OIL FOUND IN ENGINE OIL TANK. ADDITIONALLY, THERE WAS NO OIL FOUND ON EITHER THE TRANSMMISSION OR ENGINE DECKS; JUST TRACES OF OIL WERE FOUND ON POWER TURBINE BLADES AND TAIL BOOM. **THIS AIRCRAFT REMAINS OUT OF SERVICE AT THIS TIME PENDING AN ENGINE CHANGE AS A RESULT OF SOME INTERNAL FAILURE OF THE ENGINE. **