I have a similar problem, found a leak that I thought was coming from the rear top of the engine, this was months ago, kept looking and thought it was the top rad hose where it entered the engine, cleaned and tightened clamp, seemed to go away only for a few more drops a week later, kept looking finally used a powerful light to examine the rad area from both sides, hard to see anything in front, too many coolers, pipes etc but looking from the fan side I could see antifreeze in the rad fins, the plastic shroud surrounding the fan was greasy with antifreeze and dust, looking at the top I could see antifreeze surrounding the rad completely where the cap meets the fins, the outlet to the hose feeding the engine is about 1/4 inch above this area, I hope the hose clamp was not tight enough or the cap released antifreeze when it allows antifreeze to go to the overflow tank, there may have been too much in the rad when I got it and since I don't use the tractor too much it is taking a long time to equalize, or the hose clamp may have been too loose, I notice the tank level is at the lowest level mark, and when I remove the rad cap the rad is full to the very top, actually spilled a little, I have left it alone and place cloths on the floor, about 2 drops a day fall, but I should have blown out the rad fins to clear the antifreeze that was already there, I'll take it out and drive it a bit, blow out the rad or maybe the fan will suck it out , does anyone know the pressure for the rad cap, mine has 6 but no other markings, psig ? I'll check back later to see if anyone has ideas.
God bless all
NOTE: I forgot to include this link, very good information,
Kubota Servicing 101: Part 3 ? Cooling System | OrangeTractorTalks
Hope this is OK.
Jim