Questão jurídica principal
Whether the cantonal court arbitrarily assessed the credibility of witnesses concerning an alleged release from the suretyship.
Decisão extraída
The cantonal court's credibility assessment was not arbitrary.
Fundamentação extraída
The court could reasonably doubt the witnesses because of their personal and financial interests, their relationship to the appellant, and the absence of any clear testimony that the creditor expressly agreed to release the suretyship.