What was found
DURING CRUISE, THE NR 1 ENGINE OIL QUANTITY STARTED DEPLETING. THE AIRCRAFT MADE AN UNSCHEDULED LANDING AT SHV WITHOUT INCIDENT. OIL QUANTITY INDICATION WAS NEAR ZERO WITH OIL PRESS AND TEMP NORMAL. FOUND THE OIL FILTER BYPASS SWITCH RETURN LINE LEAKING AT ITS THREADED CONNECTION TO THE ACCESSORY GEAR BOX. REPAIRED THREADS WITH HELI-COIL INSERT, RECONNECTED OIL LINE, SERVICED ENGINE OIL AND LEAK CHECKED GOOD. (M)