Upon completion of the hearing and the incorporation of the summary or transcript in the record, the administrative law judge will send the record and proposed findings of fact on the issues presented at the hearing to the Board. The proposed findings of fact will not be served upon the parties; however, the parties and the Bureau may, within 15 days after the completion of the transcript or the summary of the evidence, file with the Board such briefs or statements as they may wish respecting the facts developed at the hearing.