What was found
IN FLIGHT SHUT DOWN OF #1 ENGINE DUE TO LEFT OIL QUANTITY DEPLETED TO ZERO. LEFT OIL PRESSURE EICAS, LOWEST 10. AIRCRAFT GROUNDED FOR FURHTER INSPECTION AND MAINTENANCE. FLIGHT DATA ANALYSIS SHOWED ENGINE RAN BELOW MINIMUM PRESSURE FOR LONGER THAN AUTHORIZED BY AIRCRAFT MAINTENANCE MANUAL. REMOVED AND REPLACED #1 ENGINE IN ACCORDANCE WITH B767 AIRCRAFT MAINTENANCE MANUAL 71-00-02 AND ATI TASK CARD ATI-71-999-04-01. ENGINE RUN TEST #8 IN ACCORDANCE WITH B767 AIRCRAFT MAINTENACE MANUAL 71-00-00 NOTED NO FAULTS ALL PARAMETERS NORMAL. AIRCRAFT RELEASED FOR SERVICE.