As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YAW ACTUATOR CAUTION CAME ON IN FLIGHT ON CAD. MAINTENANCE PERFORMED AIRBUS RESET. A/C SHUTDOWN AND CANON PLUG DISCONNECTED AND CLEANED. DURING TROUBLESHOOTING FOUND VALID SIGNAL ON PIN 9 AT YAW SAS TEST CONNECTOR BUT NO VALID SIGNAL OUT OF YAW SEMA ON PIN 17 OF THE AFCS TEST CONNECTOR. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 22-10-00, 4-7.