Ariz. Rev. Stat. § 38-937
A. The board may terminate the participation of a participating employer in the prefunding plan if any of the following applies:
B. If the board terminates the participation of a participating employer in the prefunding plan as described in subsection A, paragraph 1, 2 or 3 of this section, any assets attributable to that participating employer's transfers into the prefunding plan, including any earnings on such assets, after the payment of any obligation of that participating employer owed to the prefunding plan for reasonable administrative costs, shall be transferred to the system to pay the participating employer's required pension contributions under the applicable defined benefit pension. Any remaining monies in excess of the amount necessary to satisfy the participating employer's required pension contributions shall be transferred to the participating employer only if both of the following apply: