Have had an oil leak for a while. Kept been trying to fix it for a while. The "Non-Serviceable" plug on the HPOP was leaking. It was an old pump so I went ahead and put a new pump in. I mic the pump and the surface it was going on before I put it in. Not even a 1/1000 off. After I put the pump back in it is still leaking from off the bottom of the HPOP. About 1 drip every 9 seconds when it is running. Any ideas?