Well the jtube usually will leak right down that side by starter and that side of block. I dunno what kind of jtube that is, ive only seen metal ones with like 2 inch hose on it, that looks like rubber hose all the way. Im sure that is the source of the leak on either end. You could try tightening that clamp some, but it could be the other end to. But if there is any coolant up there its most likely that jtube.