Evening all.
So I purchased the piggy back part 5Q0-713-128-A and I have tried twice today to fit it but either I am doing something wrong or the piggy back part has a fault.
Having removed the trim I disconnected the connecter with a green switch that connects into the front of the selector housing, I inserted this into the piggy back part and then connected the duplicate piggy back connector to the car.
I then removed the horizontal screw from the selector housing, placed the switch on top and then replaced the screw, a very fiddly job. I then added the four retaining clips. Turning the key I am still getting the bong and the warning plus I am now getting an additional warning 'Error: gearbox' and the gear selector is stuck in P. On both occasions I had to remove the piggy back unit and return it to standard which then removed the 'Error: gearbox' warning and allowed me to move the selector.