California Code, Probate Code - PROB § 2614

(a) Within 30 days after the inventory and appraisal is filed, the guardian or conservator or any creditor or other interested person may file written objections to any or all appraisals. The clerk shall set the objections for hearing not less than 15 days after their filing.

(b) Notice of the hearing, together with a copy of the objections, shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1. If the appraisal was made by a probate referee, the person objecting shall also deliver pursuant to Section 1215 notice of the hearing and a copy of the objection to the probate referee at least 15 days before the time set for the hearing.

(c) The court shall determine the objections and may fix the true value of any asset to which objection has been filed. For the purpose of this subdivision, the court may cause an independent appraisal or appraisals to be made by at least one additional appraiser at the expense of the estate or, if the objecting party is not the guardian or conservator and the objection is rejected by the court, the court may assess the cost of any additional appraisal or appraisals against the objecting party.