Mag pump question

Hello all, I have a Mag 3 on my Remora skimmer, the pump is roughly 3-5 years old . My question here is could it skim less due to a worn out impeller? just wondering if it should be replaced..
Many thanks ,
Lee
 
open it up u can see if its worn out might be cloged, i had one that the houseing cracked and the impeller magnet shaft was wollowing it out
 
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