Ford 4600 power steering leak

Our 4600 is leaking fluid from somewhere, it only appears to be doing it while sitting, not running. All the lines/fittings are tight, but it appears to be dripping off of the lower fitting, onto the bolt heads that attach the engine and front end, and on down to the rail of the block for the oil pan. Here's a couple pictures I grabbed the other day. Any ideas on what we should be looking at?

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I've seen fittings overs tightened (or even just old) and they will crack and leak. Replace the fitting and it's normally gone if you can't pin point it directly.