I have an old jacuzzi hot tub about 13+ years old. The control panel is 1 knob and 1 cycle button with 1 light that indicates the heater is on. I've noticed the last few years if the pump runs on high for about 30+ minutes, the pump, heater and light shut off and the heater light blinks. After about 30-60 minutes, the blinking stops and all will work again. Some times it will fail on low if the pump runs for a while. I'm thinking the pump is ready to be changed out. What do you think?