CCP 375     

Art. 375.  Neglect, failure, or refusal of expert or legal representative to perform a legal duty when ordered to do so, subjects him to punishment for contempt of court

The neglect, failure, or refusal of an expert appointed by the court, or a legal representative appointed or confirmed by the court, to perform a legal duty when ordered to do so by the court, subjects him to punishment for contempt of the court.