Pittsfield (Mass.) Contributory Retirement System is searching for a custodian, said Karen Lancto, acting executive director. She said the $82 million retirement system will review the proposals before deciding whether to replace its current custodian, which she would not identify. Nelsons 2001 Directory lists the systems consultant as BankBoston, which was acquired by Fleet Financial last year. Proposals are due 4 p.m. EST Dec. 28 and should be sent to Karen Lancto, acting executive director, Pittsfield Retirement Board.