Sailorman3, Hailing from a PAB family, I get it. You spent the cash or signed the note and received a series of headaches....new Kioti CK3510 that leaks, garage floor full of UDT, no extra, expensive UDT stored in the garage to fill it back up, and you probably have a list of projects & task that you want to use it for. I get it...you wanted a new tractor and got multiple headaches....hassles before the first payment.
I don't know if this is a Dealer, Transportation or Factory OEM problem, but please coordinate with your Dealer for the fix. I would NOT put a wrench to it. It may be a fitting or seal a Kioti tech could fix in minutes. Absolutely do not put a wrench too it while under pressure.
Be happy it's ONLY an external line, probably a remote as you mentioned, maybe a bad hose. You could get out the baby powder and try to find the exact location. This is probably a ticky-tack leak problem....may have happened during transport of the tractor? Yes, this could be a "lack of attention to detail" or "testing" problem, but it's still small. Nobody's asking to split the tractor and replace a hydraulic pump.
Rest assured your Kioti CK3510 is a fine choice and will serve you long & well. I've used a Kioti 45HP at a neighbor for a 3 day drainage project. It was a good tractor....for a Korean, reverse-engineered Kubota. The neighbor paid 20% less and had more HP and a cab. I had to adjust to the loader operation, but it was way smoother than one of those JD loaders that feels like some other company designed & built the loader as an oops, we forgot something, attachment.
You bought a good tractor....but we still may make fun of you! I forgot to mention you probably waited for this too, not to mention any comments your wife may be making about your purchase.
I am sorry you're getting to know your Dealer's service dept sooner rather than later.
Maybe leverage this for the rest of the 2.5 gal container of UDT?
Hoping it's fixed soon......very near future "Tractor Time" will chill you out. After updating us about how your Dealer fixed this with lightning speed, You should post next time about your personal tractor skill limitations with how much you keep getting off the tractor to do things.