Check your valve cover gaskets. All 3 of my subaru engines developed leaky gaskets after about ten years. On the SVX a leaking valve cover gasket will mock a cam seal leak but stops just short of entering the sealed timing belt cover. The rubber gets brittle and seemed to have shrunk a tad. There's no substitute for laying on your back under the car, and if you don't know yet the belly pan comes off easily to expose the belly of the beast.