Cal. PROB § 19050

Except as provided in Section 19054, if the trustee has knowledge of a creditor of the deceased settlor, the trustee shall give notice to the creditor. The notice shall be given as provided in Section 1215. For the purpose of this section, a trustee has knowledge of a creditor of the deceased settlor if the trustee is aware that the creditor has demanded payment from the deceased settlor or the trust estate.