Most people take their computer into Best Buy or the Apple Store when something goes wrong. I also see small PC repair places around many towns near me.
I’m sure very few of them are fixing PCBs, if that’s the problem, but PC repair businesses exist.
I had the board in a MacBook Pro go bad. I took it to the Apple Store. Maybe they sent it out for the repair, or maybe not, but all my interactions were with the local store. I wasn’t shipping anything myself or calling anyone on the phone.
For instance, the GPU of my gaming laptop died, what do I do to fix it from a local store?