They said the only thing they can do is send it to the depot for repair. I don't know if a replacement option will magically become available if it reaches a certain number of repair attempts. Some people on the forums say 3 or 4 repairs, but it might depend on the state or country which have different consumer rights laws. Apparently they have it easy in the UK. There's a video on YouTube that says you just have to say 3 words to Apple, but that doesn't work in the US I guess.
If some issue develops with his Mac they can't fix they'll either continue to give him the runaround or replace it with a 7,1 or newer, depending what they have available to give as a like for like exchange. Of course never ever intentionally cause any damage to the Mac because that violates the terms of the AppleCare+ agreement. I don't know how it works out if there's an issue they can't duplicate. Just keep sending it back I guess.
Good heavens, that is nuts! What is the problem with the device?
Well just an update on my friends 6,1. Apple did agree to provide Apple Care on the unit from OWC, and he purchased AC+, so I guess he has official Apple coverage until 2025. He needs a system that runs macOS 10.12, so hopefully if anything happens with the hardware down the road, they will be able to repair the thing rather than upgrade him to something newer. I am not convinced Apple Care was a smart purchase for him, but he wanted it.
Only bummer is Apple is still unable to verify if the thing is new, refurbished, or what. Seems like they absolutely should be able to lookup a devices history from the serial number, but they mainly seem confused that the device has a manufacturing date of June, 2020 when it was discontinued in Dec. 2019.
If my friend lets me, I will try to do a ROM dump, just to see what that shows.