What was found
AUTO THROTTLE, AUTO PILOT, FLIGHT DIRECTOR, TRP, ALTITDE ALERTER KICKED OFF LINE IN FLIGHT. MAINTENANCE, FAULT CODES SHOWED NR 1 & NR 2 ADC'S INVALID FAULTS. COULD NOT DUPLICATE FAULT ON GROUND. REPLACED ADAU FOR PRECAUTIONS, SYSTEMS ALL CHECK GOOD IAW AVRO RJ-85 MM SECTIONS 34, 22, 76.