Plant investigation: the device was returned to the manufacturer for analysis.An external inspection of the received device found no discrepancies.A crit-line iv monitor recognized the clic device during a verify accuracy test, though the monitor did not recognize that the device was attached to a verification filter.The device¿s led was lit.The monitor must recognize that the device is attached to a verification filter to perform a verify accuracy test or a field calibration.An internal inspection of the clic device found corrosion on the receiver board and heat damage to resistor r134 on the board.Failure of the receiver board will cause the problem of the crit-line iv monitor to recognize the verification filter.Corrosion will cause the observed heat damage.A records review was performed on the reported serial number.An investigation of the device manufacturing records was conducted by the manufacturer.There were no non-conformances, or any associated rework identified during the manufacturing process which could be related to the reported event.In addition, the device history record (dhr) review confirmed the results of the in-progress and final quality control (qc) testing met all requirements.The investigation into the cause of the reported problem was not able to be confirmed.A definitive conclusion regarding the complaint incident cannot be reached without a physical examination of the complaint device.
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