Mackbook Pro Retina with a green line on display

My Macbook Pro Retina (Mid 14) has a display issue. A green line is visible when it displays a black or very dark background. Nevertheless it is not visible on the light background. When I touch the screen just over the line it disappears, and when I touch it just below the line becomes much more pronounced. My laptop did not suffer from any mechanical impacts. The screen was entirely replaced in October 2017. What is the problem and how to fix it?