Where hearings have been held before the Board, only those members of the Board who have attended all hearings on the complaint shall participate in the determination of the complaint. Within fifteen (15) days of the close of the hearing, the decision shall be rendered in the form of a written order which shall include findings of fact, a statement of whether the respondent has violated Section 173.04, and such remedial actions as the Board may order pursuant to Section 173.15. The order shall be served upon the parties by certified mail within fifteen (15) days of the date of the decision. The order shall be available for public inspection, and a copy shall be provided to any person upon request and payment of production costs.