(b)(4).The item was requested to be returned to the factory for investigation.However, the sample was supposedly returned along with another sample under a different complaint number, and that complaint number is not known.It has not been possible to locate, and therefore, investigate and evaluate the product.As such, the reported issue cannot be confirmed.Positive pressure within the reservoir could be caused by a number of different factors (for example, blockage of the cardiotomy filter or the defoaming unit), but without directly investigating the item in question, it is not possible to establish a clear root cause for the reported issue.It was not possible to perform a dhr review for this complaint, as the product/part details such as the material number and lot number are not known.Based on the investigation and trending for the issue, a systemic issue is not indicated.Due to lack of the product for identification and evaluation, no further investigation is currently possible, and the complaint will be closed.Should the sample for this complaint be located, an investigation will be carried out and the complaint reopened and updated as appropriate.
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