29 CFR 2700.23: Review of a subsequent citation or order.

(a) The contesting party shall file any subsequent citation or order that modifies or terminates the citation or order under review within 30 days of its receipt. The notice of contest under section 105 or section 107 of the Act, 30 U.S.C. 815 and 817, unless withdrawn, shall be deemed to challenge any such subsequent citation or order.

(b) A person who is not a party in a pending proceeding for review of a citation or order may obtain review of a modification or termination of the citation or order by filing a notice of contest under section 105 or section 107 of the Act. The notice of contest shall be filed within 30 days of receipt of the citation or order that modifies or terminates the citation or order being reviewed.