Thank you for that info. I cannot find any real confirmation on where these are, or how many. I have a cab model and it looks like those lines are darn near impossible to get to easily. There is a breather toward the front/firewall right behind the motor on the trans that I was able to get to. It seemed to have a bit of an obstruction. I cleared it out but still have the issue. So I will have to see how I can get the rear breather off (and then back on) that under the cab/seat area... I noticed there are 2 tubes that run up the back of the cab, coming out of the trans, near the 3pt and rear remote area, on the outside of the cab, from that part of the trans area. I checked those well but it looks like I need to remove it completely to be sure. From the odor, one seemed to be fuel, the other hydraulic. Unfortunately, the other end is buried under the cab.oops...I believe you'll find the vent hose for the gearcase on the top of the transmission under the seat or if it's a cab model, under the rear seat pan. the vents are located....
Something new I found in this area while looking for clues: After running for a bit - water dripping down from that area. It's was very hot out and I had the AC running. Possibly AC condensation run off? It didn't have a smell to it and was just clear, watery drips. coming out of that breather tube area, running off the side of the trans. Again, this was under the cab so not like rain could have easily gotten in that area. Not sure if it is related or not. I can't say I've ever noticed water dripping from there but I may not been looking...
Anyway...
I ran the tractor for a bit and it seems like no matter how much fluid comes out, when I check the dipstick it stays at the same - overly full, level.
I also confirmed that the radiator is completely full of coolant so I'm pretty certain it's not due to any coolant leak.
The search continues but I do thank everyone for the help and advice - or once I get to the rest of the tubes, how it goes.