What was found
ON LIFTOFF, ACTUATOR CAUTION CAME ON. WHEN TRYING TO BUILD BACK UP, THE YAW CAUTION ON THE PFD WAS ILLUMINATED, HOWEVER, AP1/AP2 TURNED ON AS THEY SHOULD. TROUBLESHOOTING DETECTED THE YAW SEMA TO BE STICKING AND RACHETY CAUSING ACTUATOR CAUTION. REMOVED AND REPLACED SEMA ACTUATOR, TEST FLIGHT SUCCESSFULLY COMPLETED.