5 Guam Code Ann. § 34203
(b) The notice of proposed action shall inform the non-custodial parent that the Department will certify the non-custodial parent’s non- compliance to the licensing body, unless, within twenty (20) days of service of the notice of proposed action, the non-custodial parent undertakes one of the following actions:
(1) files a petition for an administrative hearing, or
(2) files with the court a motion to establish payments on an arrearage for which no payments have been ordered, a motion to modify an order for payments on an arrearage so as to encompass arrears for which no payment had been theretofore ordered, or a motion to modify an existing order for payments on the arrearage; provided, payment on arrears has not been established or modified in the previous two (2) years; or
(3) comes into compliance with the court order of support, and is issued written confirmation of compliance.
(c) The notice of proposed action shall inform the non-custodial parent of how the non-custodial parent can obtain compliance with the court order of support.
(d) Service of the notice of proposed action must be made by personal service or, if unable to locate the non-custodial parent, then by certified mail, return receipt requested.