39 C.F.R. §§ 3021.41–3021.43

The statement or brief of petitioner and of any other participant seeking to have the Commission return the entire matter to the Postal Service for further consideration, shall be filed not more than 20 days after the filing of the administrative record.

The statement or brief of the Postal Service, and of any other participant opposing return of the matter for further consideration, shall be filed not more than 14 days after the date for filing of petitioner's statement.

Petitioner, and any other participant seeking to have the Commission return the matter for further consideration, may file a reply to the Postal Service response not more than 10 days after the date of the Postal Service response. Replies are limited to issues discussed in the responses of the Postal Service and other participants seeking affirmation of the Postal Service determination.