I have a 2.5 HP Pentair pump that will not start on its own. It hums and if I turn the shaft with a wrench eventually it will slowly turn and start, runs fine from that point on. I have cleaned the impellor, very little debris. I need to repeat process everyday to get the pump going. After reading many threads on this issue, I suspect, bad capacitor, however, should the shaft require a wrench to turn? I cannot turn the shaft with my hand. Is it possible motor bearings are shot? If motor capacitor is problem, where can I find the part? Pentair only sells as an assembly. Thanks for any thoughts/guidance!!