I have a suction side leak. Bubbles in returns. Seems to be getting worse. I have checked the pump basket lid, the drain valves in the pump. O rings clean and lubed. Checked bottom drain and skimmer valves. Also all PVC connections above ground on suction side. Used the slow hose/water method. I did not see anything change in the pump basket when I used the water method. Prior to digging does anyone have any other suggestions or techniques for checking above ground?