Any interested party, including a party subsequently acquiring an interest in the subject matter of the injunction, may file a petition in the municipal court to have a judgment of injunction vacated or modified. The petition shall be verified, and shall state that there has been a change of conditions rendering the injunction unnecessary or partially unnecessary and that petitioners interests’ are being adversely affected. The changed conditions shall be stated in reasonable detail. The procedure pertaining to original complaints for injunctions shall be followed. After hearing, the judge may vacate or modify the injunction. (C.O. 11 § 8, 12-31-67.)