What was found
YAW SAS AND BACK-UP SAS FAILED DURING RUN-UP; WOULD NOT PASS AP TEST AFTER NUMEROUS AVIONIC RESETS. TEST FLIGHT: CONDUCTED AIRBUS REBOOT PRIOR TO MOC, DURING AP TEST YAW CAUTION DISPLAYED ON BOTH PILOTS PFDS, AP1 AND AP2 YAW SAS, ACTUATOR, SAS BACKUP DISPLAYED ON CAD DURING AUTOPILOT TEST. AUTOPILOT TEST RAN TWICE. ALL ASSOCIATED AUTOPILOT CIRCUIT BREAKERS RESET IN BETWEEN AUTOPILOT TESTS. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-14.