Answer to "Horizontal line on bottom of MacBook Pro 2017 (Due to overheating)"Hello @danj, I got the same problem actually, I called Apple, they did an online Diagonistic, there was a problem with the battery. I was so lucky because there is a program from Apple (Keyboard Replacement). They replaced the Upper-Case and after that the problem still there! I left the MacBook for 1 Month and after that I started it up and the problem reduces so much. The lines before were like 4cm height from the bottom of the screen. After the month just some lines appears on the Botton when the Mac overheated. I called Apple again and I told them about this issue because I have 90 days Warranty for the replaced parts after repair. I will try to get that fixed for free otherwise I have to buy like almost 600 Euro for the Display! This is my experience. Thank you all!