My disty delivers panels locally. I make them sit and wait while we unbox, power up, configure and test each display with a pattern generator...Two deliveries ago, I caught debris between the outer screen membrane and the LCD element. We refused the display and sent it back for a replacement.

I've heard of pixel fixer videos.... never tried myself. I wonder if it's worth a try. anyone else try it?

My initial skepticism would be no.
But then we had a guy on this forum stick his Sharp TV board in an oven and bake it. It fixed the problem (pretty amazing) but I wagered the baking would cause other issues later down the road. Over a year later his TV was still going fine. So you just never really know.
All we can do is make the most likely assumptions, based on our knowledge & experience.

That's a half baked idea if I ever heard one.

When reflowing a PCB it would be best to use a real reflow oven to get the best heat distribution, etc. (and you might be able to find someone local that has one) but a regular oven will reflow the connections and if there was a bad connection it might work. I think the main problem is that if heat caused the 'issue' in the first place and the PCB heats up to the same level the solder connection/s could go bad again (XBOX360's).