Well, he didn't modify it. Regardless, Apple won't sell the parts, so nobody can fix it. Which seems unacceptable for a "professional" device. My company uses MacBook Pros and iMacs that we have to fix ourselves because we aren't located near an Apple Authorized Service Center and can't afford to wait 1-2 weeks to ship everything out for repair. For high-end video editing we're sticking with PC's for fear of being hung out to dry by Apple. We'd like to get a couple iMac Pros, but can't risk it.
Not true. Apple will sell the parts to authorized service providers, which is what you are supposed to use. A "professional" device is a not a device you tear down for giggles when you don't know what you are doing. Are you telling me those guys in the video are "professionals?"
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If he's willing to pay for the repairs they should fix it. The warranty is void and I'd understand if they refused to warranty the repair as well but outright refusing to do so and not supplying parts to do it is Apple just being *******s.
This is yet another example of why right to repair laws might not be so crazy.
He has a right to repair it himself just like he has a right to take it apart for no reason, which is what he did. His right to repair does not mean anyone has to help him (e.g. by giving him parts). When he decided to take it apart for no reason he lost his right to make anyone help him fix it.