Me. Rev. Stat. tit. 18-C, § 3-708

If any property not included in the original inventory comes to the knowledge of a personal representative or if the personal representative learns that the value or description indicated in the original inventory for any item is erroneous or misleading, the personal representative shall make a supplementary inventory or appraisement showing the market value as of the date of the decedent's death of the new item or the revised market value or descriptions, and the appraisers or other data relied upon, if any, and file the supplementary inventory or appraisement with the court or mail or furnish copies of the supplementary inventory or appraisement or information about the supplementary inventory or appraisement to persons interested in the new information.