My pump is sounding noisy, I can see bubbles in the pump gasket. I replaced the pump basket as it had a tear in it, I lubed the o-ring but it still has visible bubbles. The dial on top of my filter reads 0 and won't move to give a reading. I turned the dial to let out any air. The Hayward Navigator runs when I have the valve turned to the off position. If it would be a blockage somewhere then I am at a loss as to how I would fix it. The water line seems a little low so I will go fill it now. I have no idea about return lines etc. What should I start by checking?