Very interesting this one, I went into the Apple Store this afternoon, my FaceTime camera stopped working, sometimes it didn't show a display other times it did. (MacBook Pro 2018 15inch)
The genius guy was one of the best I dealt with in a long time, he knew about the forums, he knew about Flexgate and what people are saying, didn't play it dumb. I was so thrilled with this, I'm sure a lot of us have experienced different.
Anyway, my point was that he ended up changing two items -
661-10355 Display, Space Gray £ 452.00
923-02502 eDP Flex Cable £ 8.00
S1490LL/A Hardware Repair Labor £ 69.00
Total £ 529.00
Of course, I was within warranty and there was no cost, but what's interesting is this eDP Flex Cable is being added on separately. He knew for my situation the fault could be within the display itself (i.e. the camera might be faulty) hence he changed the display too. But for folks with just a flex cable problem, maybe it will be a simple £8.00 repair for them.
This could be a very interesting solution for Apple, I don't know how this Flex Cable attaches itself to the monitor and whether it can be removed. Or whether it's the same cable that is causing 'flexgate'