Must one make up for a missed voluntary fast from several years ago, and am I required to offer expiation along with the make-up, according to the Maliki school of thought?

The Maliki school of thought obligates making up for a voluntary fast if one intentionally breaks it, but not if it was broken due to forgetfulness, ignorance, compulsion, or reliance on a closely related interpretation. The expiation for delaying a make-up fast is exclusively for delaying the make-up of Ramadan fasts.