I have hydraulic fluid leaking from the small tank mounted to the turret the last 2 times I've pumped, as far as I can tell its not from over heating the fluid.  By what I've read here on the forums and in the operators book, what I've come up with is the seals are bad in the slewing brake.  Any one replaced them before and what is involved in replacing them?  Thanks for any helpful advice.

I'm running a 40m concord, guess that would have helped a bit oops

 it also could be the slewing motor with a leaking shaft seal, that is leaking.