Former Koss Corp. executive Sujata Sachdeva is still serving time in prison, but litigation over who deserves the blame for not detecting her $34 million embezzlement scheme continues. In the latest chapter of an ongoing legal battle, Milwaukee's Park Bank has said that if it is found liable in the case, so too should Koss CEO Michael Koss and the company's auditor, Grant Thornton LLP. Park Bank denies all liability in the case. Park Bank's complaint is part of headphone and audio equipment-maker…