Root cause: potential alteration of staining in this case was due to improper operation of the compressor.The problem was solved by field service engineer with replacement of the part.Following the replacement, the instrument was fully operational within specifications, without errors and available for the user.Failure mode description: failure of the compressor, may result in false negative, background staining or uneven (weak, inconsistent) staining.This failure could be due to broken parts or malfunction causing air blow to not prepare all slides for dispense.The compressor failure mode described above has the potential to alter staining.
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