Cal. Probate Code § 8500

(a) Any interested person may petition for removal of the personal representative from office. A petition for removal may be combined with a petition for appointment of a successor personal representative under Article 7 (commencing with Section 8520). The petition shall state facts showing cause for removal. (b) On a petition for removal, or if the court otherwise has reason to believe from the court’s own knowledge or from other credible information, whether on the settlement of an account or otherwise, that there are grounds for removal, the court shall issue a citation to the personal representative to appear and show cause why the personal representative should not be removed. The court may suspend the powers of the personal representative and may make such orders as are necessary to deal with the property pending the hearing. (c) Any interested person may appear at the hearing and file a written declaration showing that the personal representative should be removed or retained. The personal representative may demur to or answer the declaration. The court may compel the attendance of the personal representative and may compel the personal representative to answer questions, on oath, concerning the administration of the estate. Failure to attend or answer is cause for removal of the personal representative from office. (d) The issues shall be heard and determined by the court. If the court is satisfied from the evidence that the citation has been duly served and cause for removal exists, the court shall remove the personal representative from office.