A terminated agency shall be liable to the system for any deficit in funding for earned benefits, as determined pursuant to Section 20577, interest at the actuarial rate from the date of termination to the date the agency pays the system, and for reasonable and necessary costs of collection, including attorney’s fees. The board shall have a lien on the assets of a terminated contracting agency, subject only to a prior lien for wages, in an amount equal to the actuarially determined deficit in funding for earned benefits of the employee members of the agency, interest, and collection costs. The assets shall also be available to pay actual costs, including attorneys’ fees, necessarily expended for collection of the lien.