Display distortion at certain lid angle, horizontal lines

Ouch! Not good!

Sadly, there is nothing you can do to fix this other than replacing the display assembly MacBook Pro 13" Retina (Late 2016-2017) Display Assembly and here’s the guide MacBook Pro 13" Touch Bar 2017 Screen Replacement

Apple altered the design in the Touch Bar & Fn systems of the display splitting the T-CON logic from within the lid to the uppercase in doing so they extended the LCD lines via a set of ribbon cables connecting to the T-CON board in the case. Sadly these ribbon cables are soldered to the two parts and not serviceable which is why you need a new display assembly

Here’s a more detailed view:

The Purple ribbon cables are the ones affected here. Either you have a damaged cable or you got wetness into the T-CON logic within the metal can.

Most of the time we see Blue cables fail FlexGate when’re the backlight cable goes and the iSight camera which is a mirror on the other side.