The ventilator was returned by the customer and evaluated and the reported issue was verified.Sechrist technician found that the set screws were loosened on the master control knob and the knob was removed.Severe scratch marks were observed at the end of the master valve assembly adjuster and brass shavings at its base, indicating the set screws had become loose during repeated use and were no longer fully secured onto the adjuster shaft.A device history review was performed on the 3000 - hbo vent, serial number (b)(4), manufactured on 04/03/2003.There is no indication that there were any relevant discrepancies during manufacturing.A review of the device history record (dhr) found no nonconformance that could cause or contribute to the reported issue.This report is submitted to comply with mdr malfunction notice 76 fr 12743 requiring the reporting of incidents involving a life-supporting and/or life-sustaining device.
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