How can I fix this in preview? (picture)

This is a screenshot (command+shift+4) of the preview application. Simple picture of a killer whale but there are those grey horizontal lines that appear and reappear as I zoom in and out. If I don't zoom in or out and leave it still, it looks just as the picture is posted with the lines. How do I fix this? It doesnt cause any performance issues but it is just annoying. Retina display to see grey lines?

If you can capture it in a screenshot, it is in the display Buffer, not in the display.
Your repair should come with at least a 90-day warranty. It does not happen often, but sometimes the parts are bad, or they fail quickly once in service. Take it back to the repair center for further repairs (but they should cover them, not you).
It is very, very unusual for this kind of screen artifacts to be caused by software. I have never seen a case where it was. There are a few characteristically software-based problems, but these are generally smaller repeating boxes of one part of the screen overdrawn in a completely regular pattern across the entire screen.
Some of these MacBooks use display-buffer-shared with Main memory when using integrated graphics. It is possible you have a mis-diagnosed RAM problem.

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Version: 6.0 Service Pack 2
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Free memory: 1631 MB
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Video Mode: 1680 x 1050 x 4294967296 colors
Video Card Caption: ATI Radeon HD 4800 Series
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It was, you just didn't notice it

How can I fix this in preview? (picture)

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