If anyone is here looking for tips on replacing the screen I just did my first P4XL.
The front glass glue is not as strong as I was expecting but they are not kidding when they say you won't be able to get it in one piece.
You can do this repair without removing the motherboard, but it does need to be loosened enough to move up a little to allow the board to move up. This basically means taking out the retaining screws and ribbon cables and nudging the board up over so slightly to slide the new connector in.
I managed to strip the cable with my tweezers and have now broken the cable I think. Lesson learnt, take it easy on the very thin cables.