39 CFR 956.4: (Rule 4) Petition for a hearing.

A debtor may petition for a non-hardship hearing to challenge the existence or the amount of a delinquent nontax debt owed to the Postal Service, in accordance with 31 U.S.C. 3720D and 31 CFR 285.11(b). After receiving the debtor's petition for hearing, the agency will promptly transmit the written request and any documents received from the debtor to the Postal Service for further processing and decision by the Judicial Officer Department.