Stasis ohlins issue.

I developed a clunking sound in the left front, when I looked to see what it could be I found oil. It seems the banjo fitting came loose at the top of the shock. Is there a way I can fix this in house? I have access to a nitrogen tank and shock fill kit. Im just wondering if it will need a full rebuild now that it has no oil and has been driven? Im new to rebuildable dampers.