After the Forward Markets Commission (FMC) appointed PricewaterhouseCoopers (PwC) to conduct a special audit of Multi Commodity Exchange (MCX) two months ago, the audit firm has submitted a report, sources have told CNBC-TV18. The report has found instances of volume rigging by the Indian Bullion Markets Association on MCX and has been sent to its board for follow-up action, with a final audit report expected in a months time.