Ohio Rev. Code Ann. § 2109.49

The probate judge, if the probate judge considers it necessary or upon the written application of any party interested in the trust estate, may appoint a suitable person to investigate the administration of the trust or estate and report to the court. The expense of the investigation shall be taxed as costs against the party asking for the examination or the trust fund, as the court may decree. This section shall not apply to a corporate trustee that is subject to section 1111.28 of the Revised Code.