Hopefully Kubota makes this right as it's clearly not your fault that it broke. Does Kubota offer insurance like KTAC in Canada? If you do decide to keep it insurance would relieve any worries about the fix not being correct.
No KTAC in Canada.
Locktite to hold a bearing is a normal procedure, Locktite 641 Bearing Retainer is made for that purpose.
10 Hrs labor is because the tractor had to be split mid case in order to get to the pump. However, if I discovered a bearing had moved, and I had to split the tractor, I would replace the bearing AND use Bearing retainer.
This is without a doubt related to your previous issue at 44hrs, and I would fight every step of the way including litigation if you have to, the reality is a bearing should NEVER spin inside the "Portblock" and it leads me to believe that your tractor suffers from a manufacturing flaw in the portblock and it should have been replaced under warranty initially.
Also, 1+2hrs to figure it out will continue to pile up. I am predicting they will split the tractor before they figure it out again.