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Check to see if the filter is cracked. It is probably that or the pump is damaged from freezing OR it may just have sucked up some plastic debris out of the tank if you don't have a filter. That can be taken apart and cleaned up with compressed air. IF you need more on this please get back to me and I can assist you futher as all follow ups are included in our fee.
Just checking back in to see if you got this resolved or do you still need some help and additional input from me here?