Lower right corner of instrument cluster is a little stem extruding from the lens face. If I recall properly [I'm to lazy to go out and look] it is a clear plastic stem, with a dark colored interior stem thats flush with the clear outer stem.

You will be required to take a very slender object [a toothpick works] and depress the center stem for a moment to reset the service light. Though this may seem somewhat of frustrated engineer's design, it is a vast improvement over the pre-90 240's where you have to reach behind the instrument cluster to reset a lever.