Not only are Apple products difficult and expensive to repair, but if you've done something with your device that Apple doesn't approve of and voided the warranty they may even refuse to repair it for you. You're essentially not allowed to perform iMac Pro upgrades on your own -- this voids the warranty. Only authorized third parties can do this. It's kind of ridiculous given that the design of the machine ensures thermal issues long term...and it has to be partially disassembled just to be properly cleaned!