HS Hdro's usually, but not always used the WG Door operator, the DS7 led goes low when the doors are closed. a 45 error says that your ss info is lost, look at the ss led in the controller, it should be high. the fault says that the aux door contacts are open. so if you have a WG type operator, check WG 5, terminals 1 to 3 are the aux door contacts, they go from there down to the car panel board to TB 13 then to the connection board in the controller.