Cal. Probate Code § 879.3

(a) After a noticed hearing, the court may grant a conservator access to the digital assets of a conservatee. (b) Unless otherwise ordered by the court or directed by the user, a custodian shall disclose to a conservator the catalogue of electronic communications sent or received by a conservatee and digital assets, other than the content of electronic communications, in which the conservatee has a right or interest if the conservator gives the custodian all of the following: (1) A written request for disclosure in physical or electronic form. (2) A certified copy of the court order that gives the conservator authority over the digital assets of the conservatee. (3) If requested by the custodian, either of the following: (A) A number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the account of the conservatee. (B) Evidence linking the account to the conservatee. (c) The provisions of this part are subject to Sections 2351 and 2351.5.