P.R. Laws Ap. tit. 32A, § III, Rule 48.2
A motion for new trial shall be filed within ten (10) days after a copy of the notice of the judgment is filed in the record, except that:
(a) If such motion is based on newly discovered evidence, it may be filed before the term to appeal or to seek review has expired, upon notice to the other party, the holding of a hearing, and a showing that due diligence has been exercised; and
(b) when it is based on Rule 48.1(b) it may be filed within thirty (30) days after the death or disability of the stenographer, after the unavailability or loss of the tape is diligently established, or where it is impossible to prepare a narrative statement of the evidence. The last two facts should be established within thirty (30) days after notice of the judgment.