Result of investigation: the suspect device has been returned to the manufacturer for evaluation.The event trace was reviewed, fa lab investigation revealed that various alarm codes was considered as a normal operation.The unit behaved as designed, the ventilator was sent in for download.Technician performed bench testing, all testing done with a good known test ac adapter and patient circuit connected.The unit passed 108 hours extended tests at customer settings with no abnormalities.The unit passed troubleshooting final test which includes many alarm and ventilation functions.
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