Black marks on inside of 27" iMac
My iMac is way out of warranty at this point, but there are black marks (splotches?) on the inside of both bottom corners of my screen. What is this and is it repairable? Is it even worth/cost effective to repair?
Here is a link to a video of it: https://imgur.com/a/HEjlHq8
iMac 27″ 5K, macOS 10.14