After the conclusion of the public hearing, the board of trustees:
(1) may:
(a) continue to review the tentative budget;
(b) insert any new items; or
(c) increase or decrease items of expenditure that were the proper subject of consideration at the public hearing;
(2) may not decrease the amount appropriated for debt retirement and interest or reduction of any existing deficits, as provided by Section 17B-1-613; and
(3) shall increase or decrease the total anticipated revenue to equal the net change in proposed expenditures in the budget of each fund.