(1)    Requests for revision.

      (a)    A juvenile, the juvenile’s parent, guardian, or legal custodian, any person or agency bound by a dispositional order, the district attorney or corporation counsel in the county in which the dispositional order was entered or, if the juvenile is an Indian juvenile who is in need of protection or services under s. 938.13 (4), (6), (6m), or (7), the Indian juvenile’s Indian custodian may request a revision in the order that does not involve a change in placement or a trial reunification, including a revision with respect to the amount of child support to be paid by a parent. The court may also propose a revision. The request or court proposal shall set forth in detail the nature of the proposed revision and what new information is available that affects the advisability of the court’s disposition. The request or court proposal shall be submitted to the court. The court shall hold a hearing on the matter prior to any revision of the dispositional order if the request or court proposal indicates that new information is available that affects the advisability of the court’s dispositional order, unless written waivers of objections to the revision are signed by all parties entitled to receive notice and the court approves.

      (b)    If a hearing is held, at least 3 days before the hearing the court shall notify the juvenile, the juvenile’s parent, guardian, and legal custodian, all parties bound by the dispositional order, the juvenile’s foster parent or other physical custodian described in s. 48.62 (2), and the district attorney or corporation counsel in the county in which the dispositional order was entered. If the juvenile is an Indian juvenile who is in need of protection or services under s. 938.13 (4), (6), (6m), or (7), the court shall also notify the Indian juvenile’s Indian custodian and, if that juvenile is placed outside the home of his or her parent or Indian custodian, the Indian juvenile’s tribe. A copy of the request or proposal shall be attached to the notice. If all parties consent, the court may proceed immediately with the hearing. No revision may extend the effective period of the original order, or revise an original order under s. 938.34 (6) (am) to impose more than a total of 30 days, or under s. 938.34 (3) (f) to impose more than a total of 365 days, of detention, nonsecure custody, or inpatient treatment on a juvenile.

      (c)    If the proposed revision is for a change in the amount of child support to be paid by a parent, the court shall order the juvenile’s parent to provide a statement of the income, assets, debts, and living expenses of the juvenile and the juvenile’s parent to the court and the person or agency primarily responsible for implementing the dispositional order by a date specified by the court. The clerk of court shall provide, without charge, to any parent ordered to provide that statement a document setting forth the percentage standard established by the department of children and families under s. 49.22 (9) and the manner of its application established by the department of corrections under s. 301.12 (14) (g) and listing the factors under s. 301.12 (14) (c).

      (d)    If the court orders the juvenile’s parent to provide a statement of the income, assets, debts, and living expenses of the juvenile and the juvenile’s parent to the court or if the court orders the juvenile’s parent to provide that statement to the person or agency primarily responsible for implementing the dispositional order and that person or agency is not the county department, the court shall also order the juvenile’s parent to provide that statement to the county department by a date specified by the court. The county department shall provide, without charge, to the parent a form on which to provide that statement, and the parent shall provide that statement on that form. The county department shall use the information provided in the statement to determine whether the department may claim federal foster care and adoption assistance reimbursement under 42 U.S. Code § 670 to 679a for the cost of providing care for the juvenile.

   (1m)   Evidence and statements. If a hearing is held under sub. (1) (a), any party may present evidence relevant to the issue of revision of the dispositional order. In addition, the court shall give a foster parent or other physical custodian described in s. 48.62 (2) of the juvenile a right to be heard at the hearing by permitting the foster parent or other physical custodian to make a written or oral statement during the hearing, or to submit a written statement prior to the hearing, relevant to the issue of revision. A foster parent or other physical custodian who receives notice of a hearing under sub. (1) (a) and a right to be heard under this subsection does not become a party to the proceeding on which the hearing is held solely on the basis of receiving that notice and right to be heard.

   (2)   Revision of support. If the court revises the amount of child support to be paid by a parent under the dispositional order for the care and maintenance of the parent’s juvenile who has been placed by a court order under this chapter in a residential, nonmedical facility, the court shall determine the liability of the parent under s. 301.12 (14).