39 CFR 965.8: Hearings.

(a) Generally, mail dispute cases are resolved based on written submissions. However, in the discretion of the presiding officer an oral hearing may be conducted where in the opinion of the presiding officer, the case cannot be resolved by a review of the documentary evidence.

(b) Hearings are held at 2101 Wilson Boulevard, Suite 600, Arlington, VA 22201-3078, or such other place as may be designated by the presiding officer.