Sebi is set to reopen its probe into the multi-crore IPO scam of 2003-2006, after more than a year of declaring as 'null and void' the charges made by its own committee against depository NSDL and others in the matter. Sebi will discuss afresh in its next board meeting on June 30, a two-member committee's investigation report on the scam, except the part where the market regulator itself was accused of failing in its regulatory role, sources said.