The arbitrator has the following powers; all other questions arising out of the case are reserved to the court:
The arbitrator may, but is not required to, make a record of the proceedings.
Any records of the proceedings made by or at the direction of the arbitrator are deemed the arbitrator's personal notes and are not subject to discovery, and the arbitrator must not deliver them to any party to the case or to any other person, except to an employee using the records under the arbitrator's supervision or pursuant to a subpoena issued in a criminal investigation or prosecution for perjury.
No other record may be made, and the arbitrator must not permit the presence of a stenographer or court reporter or the use of any recording device at the hearing, except as expressly permitted by (1).
Cal. R. Ct. 3.824