Cal. Prob. Code § 879
Unless otherwise ordered by the court, directed by the user, or provided in a trust, a custodian shall disclose, to a trustee that is not an original user of an account, the catalogue of electronic communications sent or received by an original or successor user and stored, carried, or maintained by the custodian in an account of the trust and any digital assets, other than the content of electronic communications, in which the trust has a right or interest if the settlor of the trust is deceased and the trustee gives the custodian all of the following:
(e) If requested by the custodian, any of the following: