What was found
AFTER TAKEOFF, RT MAIN GEAR STAYED DOWN, RETURNED FOR LANDING AT LAX. REPLACED RT GEAR SEQUENCE VALUE, LEAK AND OPS CKS GOOD. FAILED TEST FLIGHT, FOUND RT DOWN LOCK ACTUATOR SLOW TO UNLOCK GEAR. INSTALLED SERVICEABLE UNIT AND OPS CKS GOOD. CYCLED LANDING GEAR ON TEST FLIGHT, ALL SYST EMS NORMAL.