I also have a 2ET4000 with the same code. However when I tested both micro switches they are working properly. So I thought maybe they were out of adjustment. I adjusted to their 0mm tolerance spec and I still get the same code. The machine goes through its self test with no codes showing. I press the parking brake button to get the yellow lights under it to go off and then the display just shows the red (P) parking brake icon. When you depress the travel peddle you can see the electromagnetic brakes pulse as to release and feel a little travel surge but the machine goes no where and then the electromagnetic brake switch activates and the machine throws the err 1123 code. When I cycle the key it goes away. The strange thing is when I press and release the travel pedal, as long as I don't hold it down too long the electromagnetic brake just pulses and never sets the code. It's only when I hold the pedal down like you would if you wanted to drive it forward or reverse it. Anyone ever come across this?