Yeah, you'll have to pull it out again. But you might not need to disconnect the harnesses and pull it all the way out, the bulbs are accessible from the backside (remember all the little black things sticking up everywhere?) so maybe you can just tilt it out enought to replace the bulb(s) that went bad.
Then again, it might be less trouble to pull it all the way out.
And we need pics of your installed rings. Stat.