Doug,
I like to have never found my high side service port but finally located it behind the front cap, above the generator, not far from the low side port. I had to resort to sticking my camera up in that area and just take some pictures in the blind and look at the results. You can do this with an Iphone, GoPro, whatever you have. Do this and I'll bet you find it. I still say the engineer that designed the chassis air conditioning system should be slapped, how stupid to put the service ports where they did.
Bruce