Cross runway 31L at Kilo
Takeoff runway should have been briefed as 4L, as should the usual route to it that is to turn down Kilo.
How did AA106 crew think they were going to get to 4L by crossing it (not even at Kilo) and continuing on Juliet towards 4R.
This seems to have been far more than spatial disorientation.
Next issue for the investigators: is the CVR of this taxiing time going to be available to them? (which should be the reason why their take-off should also have been cancelled).