What was found
DURING ACF P/U, ACTUATOR LIGHT ILLUMINATED. TEST FLIGHT : DURING AP TEST ACTUATOR AND AP2 CAUTION MESSAGE DISPLAYED ON CAD WITH AMBER YAW MESSAGE ON BOTH PFD, SECOND AP TEST PASSED. WHEN COLLECTIVE POWER APPLIED ACTUATOR AND AP1 & AP2 MESSAGE APPEARED ON CAD, AP1 & AP2 DISPLAYED OFF ON AP CONTROL PANEL. AP CONTROL PANEL RESET AP1 &AP2, WHEN POWER APPLIED AGAIN ACTUATOR MESSAGE APPEARED ON CAD. REPLACED YAW SEMA IAW AMM 67-20-00, 4-14.