(1) Except as provided in subsections (2) and (3), in the case of the disability of a vested member, a disability retirement benefit must be granted the member in an amount actuarially equivalent to the service retirement benefit standing to the member's credit at the time of the member's disability retirement.
(2) Except as provided in subsections (1) and (3), in the case of the disability of a vested or nonvested member, if the disability is a direct result of any service or duty for the Montana judiciary, the member's disability retirement benefit must be the greater of one-half of the member's current salary or one-half of the member's highest average compensation.
(3) If the member was retired at the time of becoming disabled, the member must continue to receive the same retirement benefit previously elected.