P.R. Laws Ap. tit. 34A, § 1–A, Rule 8.12
The minor, his parents, guardian or court-appointed representative, or any person under the custody of whom said minor has been placed, may file a founded petition with the court to request the modification of the resolutory measures.
Notice of every petition to modify a resolutory measure shall be served upon the minor, his parents, or guardians, the Prosecutor and the director of the public or private body where said minor is under custody.
If the court considers that the petition alleges sufficient grounds, it shall order the Family Relations Specialist or Technician to perform an investigation on the allegations of said petition and to render a report thereabout. A hearing shall be scheduled, with notice thereof to all interested parties, to receive evidence. Once the hearing is concluded, the court shall enter a resolution concerning modification of the resolutory measures.
When changing resolutory measure from custody to parole, the term of the new measure shall not exceed the maximum for the custody. The time spent by the minor under custody shall be totally deducted from the term to be served under the new resolutory measure.