There are authorized dealers who are not John Deere directly, but they are completely subservient to John Deere (they have to be otherwise they will not get access to the software tooling required to fix equipment), the semantic difference to a farmer is inconsequential, you will be overcharged[1] and scalped because the consequences of not paying is a multi-million-dollar heap of scrap because you cannot fix it yourself.
There are no independent tools to work on this equipment because selling a license to a 3rd party software would be in breach 1201 of the DMCA
[1]: https://apnews.com/article/john-deere-repair-lawsuit-settlem... [2]: https://apnews.com/article/deere-farm-repair-tractors-monopo...