The robotic RRU-9-2 was a law enforcement unit before he became a member of the Green Lantern Corps. It is unknown how long he was active before he was abducted by the Draal, an alien race that was replacing Green Lanterns with sleeper agents. The Draal would take the Green Lanterns' rings, and clone the GLs themselves. A creature called a xanoglyph would be used to probe the Green Lantern's mind, transferring the thoughts and memories to the clone. The clone would then go back to the Green Lantern's sector. When the Draal were ready, they would strike on many worlds at one time. It is possible the Draal kept the Green Lanterns in case of any unforeseen needs.

The Green Lanterns had given up hope of escape until they were joined by ex-Green Lantern Guy Gardner, who had just been captured by the Draal. RRU-9-2 scanned the energy field that was holding them in their cell. They were caged by a high density neuron force field. Shortly, Gardner devised a plan of escape. The notion of escape was considered absurd by RRU-9-2.
[Guy Gardner #11]

The success or failure of Gardner's idea depended solely on RRU-9-2's participation. Bivvix, Gpaak, Graf Toren, Gardner, and Voz had to forcibly convince RRU-9-2 of the viability of their plan.
[Guy Gardner #12]

RRU-9-2 was taken apart, to be used against the force field. Carrying RRU-9-2's battery cell, the gelatinous Gpaak carried the terminal to the force field holding them in their cell. Gpaak was blasted into globules, but was able to reconstitute himself. Together with Gardner, the Green Lanterns fought their Draal captors.
[Guy Gardner #13]

Soon, they were able to take control of the Draal ship. Guy Gardner's clone had escaped with the fully charged yellow power ring. RRU-92 was then reassembled. Following his request, the Green Lanterns left Guy Gardner on Earth to fight his clone.
[Guy Gardner #14]

Alongside Justice League America, Guy hammered away at his clone before triangulating the clone's location for transport. The clone was brought aboard the formerly Draal ship and stripped of its yellow power ring. The Qwardian ring was then sent to its rightful owner. The Green Lanterns headed out to get their power rings back from their own replicas.
[Guy Gardner #15]

It remains to be seen if RRU-9-2 survived the destruction of the Green Lantern Corps. His current whereabouts are unknown.