Hi folks, gravelman here. I have a Kubota 2650, 2016 year. Cab tractor hst. I was grappling brush for several hours...suddenl lift arms would not lift.. very very slowly but not fast enough to operate. The grapple and roll out, roll in all fine. Hydraulic level fine, all connections fine, no leaks, no crimps. I had to trailer it to repair shop and they can not figure it out yet... any ideas out there???? thanks much