IN AN extraordinary attempt to stall the proceedings of the Public Accounts Committee ( PAC) and prevent the PAC’s report on the 2G scam from going through, the Congress on Thursday sabotaged the proceedings, and even ‘ replaced’ PAC chief Murli Manohar Joshi. But the doughty Joshi appeared determined to submit the report, which has exposed the role of the Prime Minister’s Office ( PMO), a senior Cabinet minister and a law officer of the government, besides the Department of Telecommunication in causing an estimated ` 1.76 lakh crore loss to the exchequer in the 2G spectrum scam.