Tractor Repair: Kubota Loader, source internet, control valve

Question
I have a Kubota 2410 HST tractor with a LA352 loader.  I have recently replaced all 4 control valve to bucket hoses.  The bucket will not "power down" either quickly or with any power at all.  It will "float" down fast.  The control valve is a B2006, I believe.  I have looked for a source (internet) for a used one or a new/rebuilt one and can't find one.  Can I rebuild this?  Any other ideas?  Thanks.

Answer
I do not think that the problem is in your valve. It is just a spool that slides up and down opening passages. Rebuilding is only needed if it is leaking oil on the ground. Check to make sure that the hoses are routed correctly. If you have quick couplers on the line for the valve for quick disconnect one or more might be bad causing a restriction. Also make sure all of the cylinders are good that on doesn't go up faster than its companion. This would be a sign of piston failure. Check also for heat. When you are working the loader feel each cylinder for the temperature and see if one is hotter than the others. One other thing to check is the linkage/cables make sure it is pulling the spool all the way out. Hope this helps if you still are having problems then follow up with me with your test results.