The issue is that the specialized employees is not someone you hire on payroll who has access to tools you purchase. They must be a John Deere employee who comes from out of state and costs you $$$$$$ to calibrate a sensor that could just be a simple menu button and a 20 second wait
I mean, sure, right to repair and all that, but to be clear, unless you have like 50+ tractors to maintain, it's not going to make economic sense to have a full time employee to repair them. You still want to call out, you just want the option of calling someone local with more competitive rates and a faster response time.
If John Deere is sending a tech, you've encountered something that could never be just a simple menu button. You've found a major flaw that they need to investigate in detail. John Deere would never send a tech for routine troubleshooting/repairs. That falls on the local dealership franchises. Their employees are not John Deere employees.
JD techs are all over the Midwest. No one is coming from out of state to work on your combine.