I noticed today that my main return jandy valve is leaking right below the top knob (red circle where arrow is pointing), but only when turned one way...when it's turned to pool off (as pictured) and the water is diverted only to my spa (where the handle is pointing). When I divert the flow back to splitting it again between spa and pool, the leaking stops again. Does anyone know what's wrong with the valve? Do you guys think it's one of the o-rings inside the valve? Funny that it's leaking from under the knob and not the sides where the screws are.