If you are talking about the top PCB on the controller then yes it should come with the base unit.
You may be correct6 in your thinking,though from previous experience I would change the motor encoder bearing as we recently had one of these AC controllers burn out, we fitted a s/ex unit from TVH and it ran for about 4 hours before it failed, it turned out to be the encoder that was blowing the controller, its an expensive lesson to learn!!! new from Jungheinrich they are near to £4000!!
To program these you need a LISA unit and cable as the ones we had from TVH were not pre programmed so we had to set them to the correct truck type.