3. Any board of trustees operating a local law plan on July 1, 1999, which is combined with a plan for general employees shall hold an election of the police officers, or police officers and firefighters if included, to determine whether a plan is to be established for police officers only, or for police officers and firefighters where included. Based on the election results, a new board shall be established as provided in subparagraph 1. or subparagraph 2., as appropriate. The municipality shall enact an ordinance to implement the new board by October 1, 1999. The newly established board shall take whatever action is necessary to determine the amount of assets which is attributable to police officers, or police officers and firefighters where included. Such assets shall include all employer, employee, and state contributions made by or on behalf of police officers, or police officers and firefighters where included, and any investment income derived from such contributions. All such moneys shall be transferred into the newly established retirement plan, as directed by the board. With respect to any board of trustees operating a local law plan on June 30, 1986, this paragraph does not permit the reduction of the membership percentage of police officers or police officers and firefighters. However, for the sole purpose of changing municipal representation, a municipality may by ordinance change the municipal representation on the board of trustees operating a local law plan by ordinance, only if such change does not reduce the membership percentage of police officers, or police officers and firefighters, or the membership percentage of the municipal representation.