Pennsylvania Municipal Retirement System, Harrisburg, likely will issue an RFP for an investment consultant in early September, said James Allen, secretary of the board. Trustees plan to start the search soon, because the five-year contract with Dahab Associates expires March 31. The firm will be allowed to rebid. It is expected interviews will be done at the boards November meeting. Separately, the $920 million fund is negotiating with Seix Advisors to take over a $100 million domestic bond portfolio from First Union, which recently purchased Tattersall Advisory Group. Tattersall, Richmond Capital and Reams Asset Management were finalists in the search.