So near and yet so far. Got as far as this stage only to fail.
If you look closely at the photo for this stage, just up and to the left of where you unplug the power cable, you will see a white wire going into a grey sleeve attached to a grey plastic plug of some description. That’s not what I have. What I have is five wires, two of which (one black, one brown) have tiny copper clips which suggests that they were attached to the logic board. The other three wires (two black, one grey) look like they were torn off and damaged during the removal. I’d post a photo but there doesn’t appear to be the facility for it.
C’est la vie.