Gov. Code, § 59673

If any reassessment or any refunding bond is held invalid in any action or proceedings upon any ground which would apply to the entire reassessment or entire issue of new bonds, the unpaid original bonds refunded remain in full force and effect and if they have been canceled, the treasurer of the local agency which conducted the invalid proceeding shall issue other bonds in the same tenor, force, and effect as the canceled bonds. The act under which the original bonds were issued relative to the payment of such bonds and the levy, collection, and enforcement of taxes or special assessment taxes for such bonds apply to the unpaid original bonds and to the other bonds issued to replace them.