Following the completion of the acquisition, construction, or installation of the improvements, if there are excess funds, either from bond proceeds or from assessments, after fully funding all reserves, contingency funds, or the like, the excess funds, either from bond proceeds or from assessments, shall be used to prepay the bonds at the earliest date on which the bonds may be prepaid or redeemed at a penalty or premium of two percent or less, and the amount of the outstanding assessments may be proportionately reduced to reflect prepayment of principal. Upon payment of the bonds in full, other than by refunding, all unpaid assessments may be terminated and cancelled or may be continued, as determined by the board. Any proceeds of assessments remaining or received after payment of the bonds in full shall be disposed of or used to construct, install, or acquire additional improvements, to refund assessments in a manner determined equitable by the board, or as otherwise provided in the board’s proceedings with respect to issuance of the bonds.