Hi. I recently purchased a used Acorn 180 stairlift and track that wasn’t working. I would like to install it in my home if I can get it to work. I have installed it on a short section of track to test it. The leveling motor seems to work but the drive motor isn’t working. The display is showing a “2” code which, according to the service manual, appears to be “Encoder Failure”. Is the encoder something on the circuit board? Is this something that can be fixed? Thanks for any help or suggestions. Dean