After buying an used Kubota BX24D Loader/Backhoe and restoring it had the chance to develop a simple procedure for restoring the Hydraulic Relief Valve in less than one hour without requiring to bring the tractor to the dealer.
If you want to get your Hydraulic Relief Valve restored to factory settings, I can do it for $100 plus parts cost (around $15) plus travel from J8R 1C7 to your location (at a rate of $2 per km).
If you are mechanic and want to be trained on this simple procedure and help to become happy again a lot of Kubota BX owners, I encourage you to contact me to coordinate the training details.
Note: I’m not a Kubota certified engineer.
(and I will be happy to share with you what I know)