Steve Krichmar was named interim head of operations and Brett Browchuck was chosen as head of defined contribution servicing at Putnam Investments, Boston. Mr. Krichmar is temporarily replacing Karnig Durgarian; Putnam spokesman Laura McNamara said a permanent replacement is being sought. Mr. Browchuck is replacing Virginia Pappa. The two left the firm over an investment error that cost a 401(k) plan client $1.5 million in investment income, according to Ed Haldeman, Putnam's chief executive officer. Mr. Krichmar is head of global operations services, and Mr. Browchuck will continue as chief operating officer of the investment group.