If a request for rehearing is filed within 30 days of the date of the presiding officer’s decision, the ombudsman shall, within 10 days of the receipt of the request, grant a rehearing, if it appears from the record that:

1. a. The decision was unlawful or unreasonable; and
2. b. Receipt of additional evidence, argument, or analysis is necessary to reach a decision that is lawful and reasonable.