What was found
AT ENGINE START, ATS SYSTEM ADVANCED UNCOMMANDED AT THE TIME OF A NR 2 ENGINE ROLLBACK. N2 ATTAINED APPROXIMATELY 87% BEFORE THROTTLES WERE MANUALLY RETARDED. REMOVED AND REPLACED FCU IAW 22-15-XX PERFORMED AFS/LANDS TEST IAW 22-00-XX ,22-40-XX, ALL TESTS PASSED WITHOUT FURTHER OCCURRENCES, REMOVED AND REPLACED SDAC IAW 31-55-XX, ECAM BITE TEST SHOWED SDAC FAULT. SDAC TEST CHECKED GOOD. REMOVED AND REPLACED THRUST CONTROL COMPUTER IAW 22-36-34-04-01 PERFORMED AFS TEST REF 20-40-00-5 AND ALL PASSED WITH NO FURTHER OCCURRENCES, PLACED ACFT COCKPIT CONFIGURATION TO THAT OF FLIGHT CREW PRIOR TO ENG START, PER FLIGHT CREW AUTOTHROTTLE WAS ARMED, RAN NR 2 ENG REF A300 JRH NO FAULTS OCCURRED DURING START, NR 2 ENG RESPONDED NORMALLY, WITH NR 2 ENGINE ROLL BACK AFTER START, PROCEEDED WITH NR 1 ENGINE START TO MIMIC FLIGHT CREW ACTIONS. NR 1 ENG STARTED NORMALLY AND NR 2 ENGINE REMAINED IN GROUND IDLE CONFIGURATION. CYCLED ATS SWITCH TO ARM AND DISARM SEVERAL TIMES NON COMMANDED RESPONSES OCCURRED, NR 1 AND NR 2 ENG SHUTDOWN WAS NORMAL. AFS TESTED GOOD REF 20-40-00-5. ACFT OK TO CONTINUE.