29 CFR §458.82

All motions made after the transfer of the case to the Administrative Review Board, except motions to correct the record under § 458.76(l), shall be made in writing to the Administrative Review Board. The moving party shall serve a copy of all motion papers on all other parties. A statement of service shall accompany the motion. Answers, if any, must be served on all parties and the original thereof, together with a statement of service, shall be filed with the Administrative Review Board after the hearing, within seven (7) days after service of the moving papers unless it is otherwise directed.