iPhone 7 colors dark after screen repair

I brought my iPhone 7 in to a 3rd party for a quick repair to replace my cracked screen. Everything looks fine except now my colors seem off. The most obvious being my reds which appear more an ugly brown. My blues appear almost purple too. I plan on bringing it back to them, if not the Apple store, to get this problem resolved, but I would like some feedback from the community. Is there anything I can do to fix this problem without bringing it in? Is this a problem easily fixed whether by a 3rd party or with Apple? I suppose it has something to do with them putting the new screen on. I am not sure if it is the screen itself or something else that was changed.