I've gone through quite a few defective/otherwise "imperfect" SP3 i7 256's before landing on my current one which aside from the faintest of yellow bars on the left side (completely bearable) is in fantastic out-of-box condition.
That being said, 2 of the ones I went through had a couple pen-tip sized bumps on the screen. I thought these were stuck-on bits of dirt or grime so I wiped and scratched at them and they came off to reveal little "craters." These weren't deep in fact you could barely feel them if you tried, but they were there and you could see this easily by catching their discoloration (they appear darker) in the right light.
Is this somewhat what you're experiencing?
That being said, 2 of the ones I went through had a couple pen-tip sized bumps on the screen. I thought these were stuck-on bits of dirt or grime so I wiped and scratched at them and they came off to reveal little "craters." These weren't deep in fact you could barely feel them if you tried, but they were there and you could see this easily by catching their discoloration (they appear darker) in the right light.
Is this somewhat what you're experiencing?