Yes
A modern combine is using the same computerized systems the tractors are using.
Yes
If this ruling allowing Farmers to repair their own equipment, it might save John Deere from themselves, over time, Framers will begin to switch to other manufacturers and move off of Deere Equipment.
IMO, John Deere started this policy because a group of Financial Types are running the company instead of people in touch with the farming community and their customers. This policy be Deere was an attempt to extract every last dollar from their customers by screwing them.