Well...what are you exporting for? The web? DVD? BluRay?
You shouldn't relink to the originals...you already have ProRes files. Those are high resolution and full quality. What you need to do now is export a Self Contained QT movie...so that you have one file that's the entire program, in ProRes. Full quality. And then you compress that for whatever delivery you are doing. You use Compressor or third party converters for this.
But if you want a full quality output....just export a self contained file. There is no reason to go back to the originals. You won't be gaining any quality for doing that.
Although...how did you compress the footage, and what did you compress it to?