Backlight bleed after SSD replacement

Yesterday, I opened my Steam Deck up to replace the default 256GB SSD with a 1TB SSD. I followed iFixit’s guide to the letter, and I was using their Steam Deck tool kit to make things easier for myself.

Upon completion, there is now some backlight bleed in the bottom left corner of the LCD and a faint vertical line of bleed up the left-hand side from top to bottom that wasn’t there before. I’m not sure what that could be as I was working on the opposite side of the deck to replace the SSD.

The bleed isn’t so major that I would replace my entire Steam Deck over it. It’s more noticeable on dark backgrounds like the boot up screen than when I’m in a game. I’m just feeling upset that the screen is no longer in the perfect and evenly contrasted state that I know it was in. There might also now be a reduced viewing angle from the sides where it looks more washed out/hazy, but I could just be imagining that now that I am scrutinising things!

I’m wondering what could be causing the backlight bleed after an SSD replacement. I’ve read that others have experienced this same thing after replacing their SSD. I even tried loosening the back plate screws just a tad in case I had done those back up too tightly. No change.

Any ideas what might have caused this?

I have only owned my Steam Deck for a couple of weeks. I bought it directly from Valve and it is new, not refurbished.