Questione giuridica chiave
Whether the cantonal court arbitrarily assessed the credibility of witnesses concerning an alleged release from the suretyship.
Decisione estratta
The cantonal court's credibility assessment was not arbitrary.
Motivazione estratta
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.