Interesting, current Michigan law prevents Tesla owning a service center for owner's vehicles.
However, they can work on Tesla owned vehicles (new or CPO).
Section 445.1574 Sec 14
(1) A manufacturer shall not do any of the following:
(q) Own a motor vehicle service and repair facility, except that a manufacturer may own a service and repair facility for the repair of manufacturer-owned vehicles.
Perhaps the current law suit against the state is going well?