If there exists no other place to obtain replacement parts, firmware/software necessary to run the car, and diagnostic equipment that can check trouble codes an

If there exists no other place to obtain replacement parts, firmware/software necessary to run the car, and diagnostic equipment that can check trouble codes and such, then what agreements you've signed is irrelevant. It's of no benefit that you're allowed to bring your car to Pep Boys instead of Tesla if Tesla doesn't provide Pep Boys with the parts and information they'd need to actually repair your car.