The Alaska Legislative Council Joint Committee hired Actuarial Service Co. to review the pension and health liabilities of the $8 billion Alaska Public Employees Retirement System, Juneau. The firm will review liabilities over the past five years and evaluate the reasonableness of assumptions used by the system's outside actuarial consultant, Mercer Human Resource Consulting, said Joseph Esuchanko, president. A draft of the Mercer study shows the system had an unfunded retirement liability of $3.4 billion as of June 30, 2004, Mr. Esuchanko said. Combined retirement and health liabilities are projected to spike to $4.6 billion in 2013 under a moderate scenario, returning to a modest surplus in 2030. The preliminary report is expected by April 21, with a final report due by May 31.