A proposed amendment to an existing milk promotion program may be requested by petition to the Milk Promotion Board by 10% of the affected producers or by 2/3 majority vote of the Milk Promotion Board. If any amendment to an existing milk promotion program is proposed, the Milk Promotion Board shall hold a public hearing to consider such amendment. After the close of the public hearing the Milk Promotion Board shall send copies of its findings to all parties of record appearing at the hearing. If such proposed amendment is approved by the Milk Promotion Board, a referendum may, at the Board’s discretion, be held thereon in accordance with the notice requirements of Section 8 and subject to the same voting requirements for adoption of the milk promotion program as set forth in Section 7. However, if the Board does not approve an amendment proposed by petition, a referendum shall be held thereon in accordance with the notice requirements of Section 8 and subject to the same voting requirements for adoption of the milk promotion program as set forth in Section 7.