California Code, Education Code - EDC § 48923

(a) If the county board finds that relevant and material evidence exists which, in the exercise of reasonable diligence, could not have been produced or which was improperly excluded at the hearing before the governing board, it may do either of the following:

(b) If the county board determines that the decision of the governing board is not supported by the findings required to be made by Section 48915, but evidence supporting the required findings exists in the record of the proceedings, the county board shall remand the matter to the governing board for adoption of the required findings. This remand for the adoption and inclusion of the required findings shall not result in an additional hearing pursuant to Section 48918, except that final action to expel the pupil based on the revised findings of fact shall meet all requirements of subdivisions (j) and (k) of Section 48918.

(c) In all other cases, the county board shall enter an order either affirming or reversing the decision of the governing board.  In any case in which the county board enters a decision reversing the local board, the county board may direct the local board to expunge the record of the pupil and the records of the district of any references to the expulsion action and the expulsion shall be deemed not to have occurred.