Case 580SE 4×4 Transfer Case Question

Hello All, new to the forums, there are some great threads here. I recently got a case 580SE 4x4 and I am in the process of changing all the fluids. I can't seem the find the transfer case drain and fill plugs. When I bought the 580 I got it with the 6" thick shop manual, however it doesn't really describe any maintenance in there or plug locations. Can anyone help me out. its the last thing that I need to change fluid on and everything is fresh in this machine. Thanks!