(a) If a district proposes an increase in a commission approved interest rate or a change in maturity schedule which requires no increase in bond amount or change in the commission approved tax rate, the district shall file a written statement with the executive director signed by the board president indicating that no such increase or change is required and shall provide a revised bond issue cost summary. Under these conditions, no further approval is required.(b) If a district proposes a change in a commission approved interest rate or a change in maturity schedule which requires an increase in the bond amount, approval of the commission of a bond amendment by the district is required.(c) If a district proposes a change in a commission approved interest rate or maturity schedule which requires a change in the commission approved tax rate, approval of the executive director is required. To secure such approval, the district shall file the following:(1) a resolution by the governing board requesting approval of the change;(2) a revised cost summary, if applicable, projection of revenues and expenses, and amortization schedule, as applicable;(3) a detailed explanation for the change;(4) a filing fee in the amount of $100; and(5) other information as the executive director may require.