(2) Funds derived from a tax levy within the district or the service area or service areas specifically for the purpose of paying bonded indebtedness shall be applied solely to the payment of the bonds for which the taxes were levied and may not be applied to the payment of any other indebtedness. [1995 c.357 §9; 2007 c.783 §134; 2009 c.577 §6; 2013 c.721 §4]