As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE OIL QUANTITY DECREASED FORM 3 GALLONS TO ONE-FOURTH GALLON, IN ONE HOUR. PERFORMED AND IN FLIGHT PRECAUTIONARY ENGINE SHUTDOWN AS PER AFM PROCEDURES. PERFORMED BREATHER PRESSURE, INSPECTED FOR EXTERNAL LEAKAGE. BOTH CHECKS WERE SATISFACTORY. AIRCRAFT IS CURRENTLY UNDERGOING A GEARBOX CHANGE. (M)