29 C.F.R. § 4003.59

(a) In reaching its decision, the Appeals Board shall consider those portions of the file relating to the initial determination, all material submitted by the appellant and any third parties in connection with the appeal, and any additional information submitted by PBGC staff.

(b) The decision of the Appeals Board constitutes the final agency action by the PBGC with respect to the determination which was the subject of the appeal and is binding on all parties who participated in the appeal and who were notified pursuant to § 4003.57 of their right to participate in the appeal.

(c) The decision of the Appeals Board shall be in writing, specify the relief granted, if any, state the bases for the decision, including a brief statement of the facts or legal conclusions supporting the decision, and state that the appellant has exhausted his or her administrative remedies.