Guess I'll just have to just clean it up and see whether there is any more staining or not. There isn't room to add more epoxy in there, maybe some WD40 though...
I'll also check to see if it isn't being caused by any of the shackles or other fittings I have attached there rusting due to them perhaps being made of dissimilar Stainless steel types. The staining might be coming from higher up and leaking down.