The carefusion failure analysis engineer examined the ventilator and found no problems.Operated unit at standard settings for one hour and noted that the map pressure stayed at the set 20 cmh2o.Adjusted the map to 13 cmh2o and further noted that the map pressure stayed at this set pressure.Affected patient circuit was not returned with the 3100a rental unit.Could not duplicate complaint allegation.Finding/root cause: could not duplicate map pressure is fluctuating complaint allegation.Found that the piston control knob is broken off and is missing.Vent sent to factory service department for replacement of materials as required, reword to current configuration, recalibrate, retest per specifications and then return to customer.
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