(

a) A trustee shall provide a true and complete copy of the terms of the irrevocable trust, or irrevocable portion of the trust, to each of the following:

(1) Any beneficiary of the trust who requests it, and to any heir of a deceased settlor who requests it, when a revocable trust or any portion of a revocable trust becomes irrevocable because of the death of one or more of the settlors of the trust, when a power of appointment is effective or lapses upon the death of a settlor under the circumstances described in paragraph (3) of subdivision (

a) of

Section 16061.7, or because, by the express terms of the trust, the trust becomes irrevocable within one year of the death of a settlor because of a contingency related to the death of one or more of the settlors of the trust.

(2) Any beneficiary of the trust who requests it, whenever there is a change of trustee of an irrevocable trust.

(3) If the trust is a charitable trust subject to the supervision of the Attorney General, to the Attorney General, if requested, when a revocable trust or any portion of a revocable trust becomes irrevocable because of the death of one or more of the settlors of the trust, when a power of appointment is effective or lapses upon the death of a settlor under the circumstances described in paragraph (3) of subdivision (

a) of

Section 16061.7, or because, by the express terms of the trust, the trust becomes irrevocable within one year of the death of a settlor because of a contingency related to the death of one or more of the settlors of the trust, and whenever there is a change of trustee of an irrevocable trust. (

b) The trustee shall, for purposes of this section, rely upon any final judicial determination of heirship. However, the trustee shall have discretion to make a good faith determination by any reasonable means of the heirs of a deceased settlor in the absence of a final judicial determination of heirship known to the trustee.