Cal. Probate Code § 2614.5

(a) If the guardian or conservator fails to file an inventory and appraisal within the time allowed by law or by court order, upon request of the ward or conservatee, the spouse of the ward or the spouse or domestic partner of the conservatee, any relative or friend of the ward or conservatee, or any interested person, the court shall order the guardian or conservator to file the inventory and appraisal within the time prescribed in the order or to show cause why the guardian or conservator should not be removed. The person who requested the order shall serve it upon the guardian or conservator in the manner provided in Section 415.10 or 415.30 of the Code of Civil Procedure or in a manner as is ordered by the court. (b) If the guardian or conservator fails to file the inventory and appraisal as required by the order within the time prescribed in the order, unless good cause is shown for not doing so, the court, on its own motion or on petition, may remove the guardian or conservator, revoke the letters of guardianship or conservatorship, and enter judgment accordingly, and order the guardian or conservator to file an account and to surrender the estate to the person legally entitled thereto. (c) The procedure provided in this section is optional and does not preclude the use of any other remedy or sanction when an inventory and appraisal is not timely filed.