Ariz. Rev. Stat. § 40-608
E. After transition bonds have been issued, the determination and imposition of financing charges, the recovery of financing revenues and the adjustment of the financing charges through the true-up mechanism are not subject to review or approval by any government entity including state agencies, public corporations, municipalities or other instrumentalities of this state, except that the superior court has exclusive jurisdiction to and, on commencement of a suit against the qualified special purpose entity by a customer, may review and determine whether there has been a mathematical or administrative error in any of the following:
J. The servicer, as agent for the qualified special purpose entity, at a minimum semiannually and quarterly during the two-year period preceding the final maturity date of the transition bonds or the final maturity date of the series, class or tranche of the bonds with the latest final maturity date, if more than one series, class or tranche has been issued, shall perform calculations for both of the following: