What was found
AIRCRAFT FAILED SAS AP CUT. YAW SAS WOULD NOT COME ON. AIRCRAFT DID PASS THE AUTO PILOT TEST. T/F EVAL: AP TEST WAS OK WITH NO ABNORMALITIES NOTED. DURING AP CUT, BACKUP SAS WOULD APPEAR, AS APPROPRIATE, BUT NO YAW SAS MESSAGE. WHILE AT A HOVER, THE FOLLOWING CODES WOULD DISPLAY INTERMITTENTLY ON THE SYS STATUS PAGE: DFSENX XXXXXX OR DFSENX XXX2XX. NO FAILURE MESSAGES APPEARED ON THE CAD. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-14. TESTFLIGHT SUCCESSFULLY COMPLETED.