Apple’s New Security Features Won’t Let You Repair the MacBook Pro or iMac Pro
 

The new MacBook Pro and iMac Pro models contain a special T2 chip for advanced security features, but now we know that there’s a downside: You can’t repair your own computer without it passing Apple’s official diagnostics tool… which only Apple Authorized shops can use.

https://www.howtogeek.com/fyi/apples...o-or-imac-pro/