Have a century magnetek 2 speed pump with an externally mounted capacitor on the top. The speeds are controlled via a toggle switch mounted on the rear faceplate of the motor. When operating the toggle switch, a part of the switch must have broken/rusted off and shorted the wires causing sparking until the power was killed. The switch was removed and pump operation was checked for both speeds by direct wiring. The pump operates fine on high speed but only hums on low speed. Could this be the result of a damaged capacitor? If yes, would it be the top mounted capacitor or are their other internal capacitors or other components that could have been damaged? Thanks!