Before a referee begins to serve:
In addition to any other disclosure required by law, no later than five days before the deadline for parties to file a motion for disqualification of the referee under Code of Civil Procedure section 170.6 or, if the referee is not aware of his or her appointment or of a matter subject to disclosure at that time, as soon as practicable thereafter, a referee must disclose to the parties:
Cal. R. Ct. 3.904