Sorry can't help you with that. But I'd say 99.99% chance the posted codes are correct.

If you're willing to spend $10, you can shoot them from a JP1 remote and learn them to your RTI.

EDIT: Didn't realize the 3310 was such an old model. I'm having a hard time finding codes from that year in a format that I can understand. Any possibility RTI would have the codes? They're a pretty big player, right?