If the board or eligible government unit defaults in the payment of principal or interest on an issue of notes or bonds after they become due, whether at maturity or upon call for redemption, and the default continues for 30 days or if the board or eligible government unit fails or refuses to comply with this part or defaults in an agreement made with the holders of an issue of notes or bonds, the holders of 25% of the aggregate principal amount of the outstanding notes or bonds of that issue have the right, upon proper application to a court of competent jurisdiction, to have a trustee appointed to represent the holders of those notes or bonds for the purposes provided in this part.
§ 17-5-1646, MCA