P.R. Laws Ap. tit. 32A, § III, Rule 43.2
In all actions the court shall specify the facts found and state separately its conclusions of law thereon and direct the entry of the appropriate judgment; and in granting or refusing interlocutory injunctions the court shall similarly set forth the findings of fact and conclusions of law which constitute the grounds of its decision. Findings of fact based on oral evidence shall not be set aside unless clearly erroneous, and due regard shall be given to the opportunity of the trial court to pass upon the credibility of the witnesses. The findings of a master, to the extent that the court adopts them, shall be considered as the court’s findings of fact.
Findings of fact and conclusions of law need not be specified:
(a) On decisions on motions under Rule 10 or 36, or any other motion except as provided by Rule 39.2;
(b) in default cases;
(c) by stipulation of the parties;
(d) when the court so decides in view of the nature of the cause of action or of the remedy granted by the judgment.