White built those tractors for Deutz, and even AGCO for a while. You're right, it is about all White except for the engine, front tub and sheet metal. The front axle is a ZF, just like what was used on the Whites.

As to your alarm, I'd about guarantee that it is the charge oil tube that comes off the top of the charge pump. This is under the transmission cover, under the floor of the cab. If you pull the floor mat up and take the plates off the bottom of the cab, you'll see the top of the transmission. All of the lines and rods need to be disconnected so that the transmission cover can be pulled straight up. It can't go sideways, because the rod that works the park lock runs vertically out the top. 

What's happening is there are 2 metal tubes that come out of the top of the charge pump, and they go into it with a 90 degree cast elbow held down by a little clip on the side of each one. The clip sits in a machined groove in the elbow. One tube is pressure feed to the filter, and when the filter gets dirty, the oil is cold and thick, or the filter by-pass sticks, the pressure is enough that the edge the clip holds onto breaks off, and the elbow comes out of the charge pump. It only comes out a little, as the transmission cover stops it, but it is enough that quite a bit of the oil gets dumped back into the transmission. When you use a remote, especially once the oil is warm, it lowers the pressure enough to make the alarm go off.

White and AGCO offered a kit to fix this problem. It has 2 new steel tubes, and more importantly 2 new cast elbows that have some extra cast onto them with a bolt hole going through. The clip is eliminated, and the bolt goes through the cast elbow, eliminating the problem.