I'm with the other guys in agreement that tightening them will accomplish nothing. There are some very specialized seals that keep the fluid from leaking and at the very least, they need to be replaced. Since it only has 28 hours on it, I'm thinking there might be other problems. Are you sure about the hours? Are you covered under warantee? If so, doing it yourself will probably violate your warantee. This can be very bad if it's something more serious than just some bad seals.
I paid $80 for my spanner wrench. It's adjustable and takes a 3/4 inch breaker bar. I had to get a Proto because the cheap ones just bent. Allot of times I also have to torch the fitting to melt the Loctite that's on the threads. Even then, I need to put a ten foot pipe onto my breaker bar to get them off. But I have full sized tractors, so it's a bit of a nightmare when I rebuild mine.
Right now I've spent two days trying to get one apart on my backhoe. I finally got it off after breaking the bolts on my spanner three times and loosing one of the teeth. I ended up welding a bolt into the hole and beating it off with a hammer. Half a day of beating it to bet it an eighth of an inch. This evening I have it a full turn and will finish taking it off tomorrow. Sometimes it's cheaper to drive it to the dealer and pay them to fix it.
Good luck,
Eddie