I wanted to add to this - I have a thread on my own experience 2 years ago too.
I brought the machine in for an estimate, but brought it back home to get the bootable backup done and setup a spare machine to work on. Meanwhile they had to repair order ready to go and the battery was ordered. I will say it was done very quickly once I brought it in - something like 2 days.
My problems started when I picked it up. I got it home and could see where they’d wiped the screen down leaving streaks. Due to the different lighting between the store and my house, it wasn’t really obvious in their lighting. Remember this was back in 2021 where they heavily cleaned anything coming in due to covid - and maybe they still do.
While I got the sideways marks off the monitor, there was still a whole section that was a mess. I brought it back in (all this in mid-December which is a crazy time to be at an Apple Store if you don’t need to be!). When I went back to talk about the screen they ran a single use very wet wipe over it and I actually tried to stop the guy, saying I’d never used anything wet on the screen because I thought you weren’t supposed to. I’ve always regretted not picking up one of those packets, and 2 days later they were gone from all the tables.
They said the screen was delaminated and that it had been that way when I brought it in.
Long story short, it took a chat with a lawyer, a couple more visits and a really nice manager who took the time to get on the phone with Cupertino to discuss my situation. They had two pictures they took upon intake but they were not very good. I had random pix as well that we compared to. They eventually claimed my monitor had minor traces of delimitation in two very tiny spots on an edge in their pictures (which I could never see). When I got it back it was virtually unusable. They replaced it but it wasn’t fun.
They had noted every nick and scratch on the machine and had me sign off on it, but when pressed they said delimitation was “wear and tear” and that’s why it wasn’t on the waiver. If they had seen it I’m not sure why they didn’t try to sell me a new screen while they had it. I suggested they change their policy on that and the manager agreed.
I truly believe it was wiped down with something not compatible with the screen. I had cleaned the screen with a cloth before I brought it in but they always did that extra wipe before they touched it.
Weirdly, I recently had what looks like a bad pixel show up. It’s actually a pixel-sized raised area and I have no idea what it and am afraid to poke at it too much.
Also on a semi-related topic, I picked up a 27” Cinema Display last week, and when I met the guy to buy it, I could see swipe marks from where he cleaned it before meeting me. Yes I had flashbacks. It seems ok so far. I don’t think it’s retina though, just glossy.
Anyway my advice is, besides a backup, to ask them more than once if they noted everything wrong with the machine including wear and tear items.
Diane