iPhone repair at Apple Store, unexpected replacement.

So, I brought my 3 years old iPhone 13 Mini to the Apple Store to replace the battery yesterday, they've made the diagnostics and there were 2 yellow question marks for the battery and for the screen in the test results. They said I shouldn't care about those. They returned the iPhone after 2hrs with the new battery.
Today I noticed that the screen looks more vivid than before and I do not see the issue it had before (reddish gradient tint visible on the dark background in the min level of...

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