Valsamis v. Gonzalez-Romero, 748 F.3d 61

Valsamis lent $700,000 to González-Romero; no paperwork evidencing terms or borrower identity.
Dispute centers on whether the loan was to Caribbean Carrier Holding (Panama) Inc. or González personally.
Val sambis sued in diversity in the District of Puerto Rico; no jury trial; bench trial conducted.
District court found that Valsamis failed to prove the borrower's identity by a preponderance of the evidence and entered judgment for González.
Valsamis appeals alleging Rule 52(a)(1) noncompliance and an incorrect legal standard applied.
Diversity jurisdiction arises under 28 U.S.C. § 1332(a); Puerto Rico law governs substantive debt collection.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Rule 52(a)(1) compliance	Valsamis contends the judge did not make required findings.	González argues substantial compliance suffices for Rule 52(a)(1).	Substantial compliance suffices; findings and reasoning were adequate.
Correct legal standard for debt collection	Valsamis argues court applied wrong standard to prove borrower identity.	González contends Puerto Rico law standard was correctly applied.	Court correctly applied Puerto Rico burden: creditor must show money due and debtor responsible by preponderance.

Reich v. Newspapers of New England, 44 F.3d 1060 (1st Cir. 1995) (foundational for Rule 52(a)(1) deference and sufficiency of findings)
In re Las Colinas, Inc., 426 F.2d 1005 (1st Cir. 1970) (flexibility in Rule 52(a)(1) requirements)
Kelley v. Everglades Drainage Dist., 319 U.S. 415 (1943) (principle that findings need only reveal basis for decision)
Rosario v. P.R. Land Auth., 97 D.P.R. 324 (P.R. 1969) (burden on creditor to prove debt by preponderance)
Irizarry v. Trujillo, Mercado & Co., 16 D.P.R. 20 (P.R. 1916) (burden allocation in debt cases under Puerto Rico law)
Erie R.R. Co. v. Tompkins, 304 U.S. 64 (U.S. 1938) (federal court applying state substantive law in diversity cases)