The china customer reported "staining quality unstable" with some slides.The field service engineer (fse) serviced the instrument and noted "fluid drop down from dispense tip to slides".The fse replaced the aspiration and dispense check valve which resolved this malfunction.The customer was able to complete staining with another instrument.The instrument is fully operational, within specification, and ready for use.Diagnostics were not altered.There was no direct or indirect patient harm or user harm reported.
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