III. Modification and termination of provisions for maintenance, support, educational expenses, and property disposition (750 ILCS 5/510) An order for maintenance may be modified or terminated only upon a showing of a substantial change in circumstances. The court may grant a petition for modification that seeks to apply the changes made to Section 504 by these amendments to an order entered before the effective date of these amendments only upon a finding of a substantial change in circumstances that warrants application of the changes. The enactment of the amendment itself, does not constitute a substantial change in circumstances warranting a modification. 750 ILCS 5/510(a-5).