I see on Aswo that there are 3 different door harnesses listed, if this machine has one of the ones where the wires go straight round the hinge in the flexible rubbery tube then these are very common to fail, it is not unusual that when I tug test them to find that half of the wires break, often this will cause intermittent flashing of the display first.
The display module is also a common failure, it is glued into the facia panel and moisture gets past the glue joint and onto the board and kills it (Part No is possibly 1763350007).
My advice would be to check if there is any damage to the wiring at the hinge and if the rubbery tube is damaged it would be worth having a visual on the main circuit board as I have had 2 or 3 where a wire has broken in the door hinge and shorted out on the chassis killing both circuit boards.
If you decide that in this case it is a faulty display then I would suggest that if it has the harness that goes straight round the hinge then you also persuade the customer to change that at the same time as it will almost certaintly soon fail.
Jem