Old SP-711 pressure problem

In the process of opening my pool to the worst algae in 7 seasons, I let my pressure get away from me a few times. I wanted to let the pump run all night but I didn't want to take a chance on high pressure so I switched it to recirculate mode. During the night it pumped out water to waste until it started to suck air through the skimmer. Are the internal seals leaking because of the previous high pressure? I have never replaced any of the seals so it is probably time. Is there any other reason it would pump to waste when set on recirc?