8.75 rear axle leak

Hi everyone,
need some help, just discovered a small amount of gear oil is leaking out on rear passenger side axle (wheel studs are big bolt pattern and left hand thread). Could the problem be with the axle gaskets or seals? I would like to try and fix this myself but don't know how hard it would be or what is involved (any special tools needed?)

Thanks in advance, your advice is greatly appreciated.