In a past life I had an appliance repair business. You didn’t say if the items that didn’t rinse properly were on the top or bottom rack. The only thing I can suggest is that you spin the impeller,s with your hand. They should be able to make several revolutions freely and easily. If they “hop” or bounce then they will not disperse the water effectively.
There is a bushing in the center of the impeller that sometimes wares out causing the water to spray incorrectly or not at all.
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