Methuen (Mass.) Contributory Retirement System is searching for an active domestic large-cap core equity manager to run $28 million. Funding will come from terminating the existing manager, whose performance has been lagging; Kevin Leonard, the Segal Advisors consultant who is assisting, declined to identify the existing manager. The RFP is available by e-mail from Rosemary Guillette at Segal Advisors, at [email protected]; proposals are due Feb. 28. Officials for the $70.1 million pension plan hope to make a selection by the end of May.