Definitely by far the largest problem.
The only way to perform a "Forced Manual ReGeneration" is by using the KOBD Ace Kubota electronic service tool. You can have a dealer perform it, or if you or a friend owns a KOBD Ace Kubota electronic service tool.
Kubota is constantly updating their current production equipment OPM. There are additions, corrections, new options, adding previously omitted content, etc.
At times, the supply runs low, so they reprint.
Part number K2583-13510 is mounted on the RH side of a BX tractor to operate the only brake a BX tractor has.
I have no idea what K2583-13520 is, but it is not used on a BX-series tractor