iMac Pro iMac Pro Display Problem (vertical stripe)

[oli.b.19]

Hi, today I noticed, that my iMac Pro display shows a vertical stripe (roughly 1 cm wide) that is slightly lighter than it should be. You can see it best in dark gray areas.

My machine is one year old – 10core, vega 56, 64gb ram – I use it quite extensively...

Is anyone else having this problem with their iMac Pro? Any idea what this could be?

I took a photo with my phone and increased the contrast:

 

[oli.b.19]

Ok, I found out, that it is a burn in effect and the white line is from a youtube window... I thought that this is a thing from the past.