87. Upon request of a board or the person or body entrusted, under section 82, with the implementation of a plan or, as the case may be, a by-law or any provision of a by-law, the Board may, by order, amend, repeal or replace, temporarily or definitively, all or part of a provision of a joint plan, by-law or decision of a board or committee established by a board whenever, after having heard the interested parties, it considers that the provision or decision is no longer in the public interest or in the interest of an efficient marketing of a marketed product.