What was found
AIRCRAFT WAS GROUNDED: DURING CLIMB OUT AT 2,000 FEET ELEC STABILIZER TRIM BECAME INTERMITTENT AND THEN FAILED. THE AIRCRAFT FAILED AUTO TRIMMING. COMMAND A AUTO PILOT WOULD NOT ENGAGE.COMMAND B ENGAGED FOR ABOUT 5 MINUTES AND THEN DISENGAGED. NEITHER AUTOPILOT WOULD RE-ENGAGE. SPEED TRIM FAIL ILLUMINATED DURING DESCENT PREPARING FOR APPROACH. THIS WAS DURING STAB TRIM FAIL. REMOVED AND REPLACED STABILIZER TRIM ACTUATOR (AALA202103309010) IAW AMM 27-41-71, RELAY R1192 (AALA202104079018) AND R1193 (AALA202104079019) IAW WDM 27-41-11, ELEVATOR A HYDRAULIC PRESSURE SWITCH (AALA202104079020) IAW AMM 22-11-40, AND ELEVATOR SERVO (AALA202104079021) IAW AMM 22-11-40.