Both pumps have reduced flow

Wantsomemora Acrapora

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Hey All,
I have a cor20 return pump and a closed system Cor15 pump dedicated to UV. Both pumps have reduced flow down from around 450gph to about 180gph. I took apart both pumps and cleaned and lubed where needed. There was no obstructions in either pump. Both pumps are almost 4years old. I know age can be the problem but both pumps at the same time requires more investigation. Can anyone help?
 

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