Not that this helps, but I’ve had the same problem - twice. In fact this MacBook Pro (late 2016 model) has had so many problems. Firstly 3 or 4 keys had to be replaced because they kept on falling off, and then the whole keyboard was replace. Then around 4 months ago, horizontal lines started appearing on the screen just like you describe. They were intimitant, but I hadn’t realised it was due to the connection in the hinge. Thankfully I took out AppleCare for 3 years, and they replaced the display and board. But just a week ago the problem has returned. It definitely changes depending on the angle of the display, but today it’s even worse, and the lines don’t go until I put the display at a very low angle. I am really not impressed.