39 CFR § 952.16 - Appearances.
(c) When Respondent is represented by an attorney, all pleadings and other papers subsequent to the complaint shall be mailed to the attorney.
(d) Withdrawal by any attorney representing a party must be preceded by a motion to withdraw stating the reasons therefore, and shall be granted in the discretion of the presiding officer. If a successor attorney is not appointed at the same time, withdrawing counsel shall provide adequate contact information for Respondent.
(e) Parties must promptly file a notice of change of attorney.