WAC 388-14A-3904. How do I find out the results of DCS' review for modification?

After reviewing a case under WAC 388-14A-3903 , the division of child support (DCS) notifies the parties of: (1) The findings of the review by regular mail at the parties' last known address; (2) The parties' right to challenge the review findings; and (3) The appropriate forum and procedure for challenging the review findings.