Cardiffs are pretty easy to pull apart and clean out. There's not too much to them.
Any time you have a reel issue, just google Alan Tani and the reel model.
http://alantani.com/index.php?topic=896.0
Probably just need to pop it open, clean it up a bit, and lube the bearings.
I've done it a few times to my Cardiff. Pretty simple.