What was found
DURING CRUISE AT FL 390, RECEIVED ENG 1 EIU FAULT WITH ACCOMPANIED LOSS OF AUTO THRUST. ALSO, RECEIVED AIR PACK 1 AND 2 FAULT. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURES AND DESCENDED TO 10,000 FEET MSL. AIRCRAFT DIVERTED TO DEN AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 1 ENGINE INTERFACE UNIT.