B3: date of event and d5.Operator of device is unknown; no information has been provided to date.Investigation summary: the customer reported that the time of expiratory knob was out of order with the max and min position damaged.One respiratory component module was received for evaluation.Visual inspection was performed, and the device was found to be in good physical condition.Functional testing was also performed, with the t exp button unable to set the value.The root cause was found to be the loosened knob holder.A review of the device history record (dhr) shows there were no observations or nonconformities recorded during manufacture to suggest an issue of this nature would occur with this lot of products.As a result of the investigation, the holder and knob will be replaced and adjusted, and must pass all functional tests before being shipped back to the customer.
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