Hi,
As you can see, in the upper right corner of the screen there is a crack (circled in red) in the liquid crystal layer of the screen, which is most likely causing the horizontal lines going through the LCD. I would send the the laptop to a repair shop for them to fix it for you because the Surface Laptop is very, very difficult (or maybe even impossible!) to open up with out inflicting lots of damage to both the internal components and outer casing.
[image|1761570]