Ariz. Rev. Stat. § 14-2521
C. A person serving as a qualified custodian may cease serving as a qualified custodian:
1. If the person does not designate a successor qualified custodian, by providing the testator with both of the following:
2. If the person designates a successor qualified custodian, by providing all of the following:
(b) To the successor qualified custodian, the electronic record of the electronic will and an affidavit that states all of the following:
E. If a testator designates a successor qualified custodian in a writing executed with the same formalities required for the execution of an electronic will and the successor qualified custodian executes the written statement prescribed by subsection A of this section, the person serving as qualified custodian shall cease serving in that capacity and shall provide the successor qualified custodian with both of the following: