Cal. R. 5.542
An application for a rehearing of a proceeding before a referee not acting as a temporary judge may be made by the child, parent, or guardian at any time before the expiration of 10 calendar days after service of a copy of the order and findings. The application may be directed to all, or any specified part of, the order or findings and must contain a brief statement of the factual or legal reasons for requesting the rehearing.
A rehearing must be granted if proceedings before the referee were not recorded by an official court reporter or other authorized reporting procedure.
If the proceedings before the referee have been recorded by an official court reporter or other authorized reporting procedure, the judge of the juvenile court may, after reading the transcript of the proceedings, grant or deny the application for rehearing. If the application is not denied within 20 calendar days following the date of receipt of the application, or within 45 calendar days if the court for good cause extends the time, the application must be deemed granted.
Notwithstanding (a), at any time within 20 court days after a hearing before a referee, the judge, on the judge's own motion, may order a rehearing.
Rehearings of matters heard before a referee must be conducted de novo before a judge of the juvenile court. A rehearing of a detention hearing must be held within two court days after the rehearing is granted. A rehearing of other matters heard before a referee must be held within 10 court days after the rehearing is granted.
If the judge of the juvenile court denies an application for rehearing directed in whole or in part to issues arising during a contested jurisdiction hearing, the judge must advise, either orally or in writing, the child and the parent or guardian of all of the following:
Cal. R. Ct. 5.542