Bones,
I moved from Finksburg, MD about 3 yrs ago or I'd swing by and give you a hand...
Seals that leak are normally caused by: rough/nicked cylinders, improperly assembled or tightened seals, wrong fluid, too much pressure, or worn out/dried out seals.
Since this is relatively new, your cylinders shouldn't be rough or the seals worn out, but extend your cylinder and check the rod for nicks, scratches, or rough spots. If so, that needs to be fixed or will rip out new seals, too.
Keep an eye on excessive dirt on the cylinders, which wears them faster, but shouldn't be within that time...
As long as you have the right fluid in the cylinder and your relief valve is working properly, that leaves either the assembly or tightening.
If the seal was rolled, nicked, or torn during installation, nothing you can do. If it didn't leak for quite a while when you first got it, probably unlikely.
So, tightening them is your first and most likely issue.
Relieve the pressure by rolling the bucket about midway to make bucket flat and extend about 1/4 way to make a slightly offsided triangle with the boom (where the bucket end is more verticle than the the main boom).
Might be helpful to set it next to tree, as if you have a cylinder failure, it won't be able to support itself, especially if you have to remove the cylinder.
If course, you should strap/chain the main boom and such to tree or whatever if removing a cylinder, but get into that if you have to later...
Once all is set well, shut off engine and work all joysticks in each direction. If nothing moves, pressure is relieved and structure is at rest. (Yes, for the hydraulic folks, there may be some inner cylinder pressure, but it will actually be "balanced" not relieved, but that's sufficient for non-assembly /forums/images/graemlins/smirk.gif )
Follow the good advice above for tightening your nut, which holds the seals in place and cross your fingers.
If you have to replace the seals, write back and you'll get lots of good advice.
Hope this helps explain some things.
Let us know how you make out.
-JC