So I just had my phone replaced. The screen has some other defect, no Mura apparently but it was something else. The new one doesn't have the screen issue nearly as bad but now the horizontal lines anywhere are still there. I also tested before and after Lumia Black. Amber, the lines looked different but they were there. This does appear to indicate a hardware issue with some refurb phones as the lines are in a different spot on this one. The first had it on the the right side only. This one has it milder on the right side but also has it across the top.