Finding an incorrect grading pattern


I was given a labelled data set and I was told few of the labels are wrongly assigned, i.e. some of the data were graded inaccurately. I'm supposed to find which ones. Which tool in RapidMiner should I use?
I tried the operator Find Outliers (Density), but somehow I feel that is not the one I'm looking for.
Thank you very much for advice. Markéta
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