I ordered Kubota single rear remote on my B3300SU. Tractor had to return to the Kubota shop twice to eliminate hydraulic fluid leaks relative to this option. After that "teething" problem corrected it has been leak free the succeeding two years, despite the fact that I work it in the woods where it goes through plenty of brush.
( I did have a resolved problem with brush dragging the HST Neutral switch out of tolerance so the tractor would not start.)
You have a tractor that is the cream of the crop. I am sure it will be fine after your leaks are resolved.
This is your FIRST tractor. One or two days is too soon to be impugning Kubota engineering.
Comment after 200 hours on your
L5460.