39 C.F.R. § 3030.126 – Proceedings.

(a) If the Commission determines that the rate adjustment filing does not substantially comply with the requirements of §§ 3030.122 and 3030.123, the Commission may:
1. (1) Inform the Postal Service of the deficiencies and provide an opportunity for the Postal Service to take corrective action;
2. (2) Toll or otherwise modify the procedural schedule until such time the Postal Service takes corrective action;
3. (3) Dismiss the rate adjustment filing without prejudice; or
4. (4) Take other action as deemed appropriate by the Commission.
(b) Within 21 days of the conclusion of the public comment period the Commission will determine whether the planned rate adjustments are consistent with applicable law and issue an order announcing its findings. Applicable law means only the applicable requirements of this part, Commission directives and orders, and 39 U.S.C. 3626, 3627, and 3629.
(c) If the planned rate adjustments are found consistent with applicable law, they may take effect.
(d) If the planned rate adjustments are found inconsistent with applicable law, the Commission will notify and require the Postal Service to respond to any issues of noncompliance.
(e) Following the Commission's notice of noncompliance, the Postal Service may submit an amended rate adjustment filing that describes the modifications to its planned rate adjustments that will bring its rate adjustments into compliance. An amended rate adjustment filing shall be accompanied by sufficient explanatory information to show that all deficiencies identified by the Commission have been corrected.
(f) The Commission will allow a period of 10 days from the date of the amended rate adjustment filing for public comment.
(g) The Commission will review the amended rate adjustment filing together with any comments filed for compliance and issue an order announcing its findings within 21 days after the comment period ends.
(h) If the planned rate adjustments as amended are found to be consistent with applicable law, they may take effect. However, no amended rate shall take effect until 45 days after the Postal Service transmits its rate adjustment filing specifying that rate.
(i) If the planned rate adjustments in an amended rate adjustment filing are found to be inconsistent with applicable law, the Commission shall explain the basis for its determination and suggest an appropriate remedy. Noncompliant rates may not go into effect.
(j) A Commission finding that a planned rate adjustment is in compliance with the applicable requirements of this part, Commission directives and orders, and 39 U.S.C. 3626, 3627, and 3629 is decided on the merits. A Commission finding that a planned rate adjustment does not contravene other policies of 39 U.S.C. chapter 36, subchapter I, is provisional and subject to subsequent review.