The electronic log file was available for investigation.Several log entries indicate that there was a negative pressure detected various times.Based on these log entries it was concluded that the auxiliary air valve was (temporarily) stuck open, leading to restricted automatic ventilation.Depending on the actual situation the system will post corresponding alarms, such as insp o2 low; minute volume low; insp pres not reach; apnea pressure.Software performs a valve test as part of the leak test.The number of similar cases is within the expected range of the respective risk assessment and thus accepted.
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