Hi 2x: I just saw your posted question. I would say that you clutch slave is definitely leaking.
If you fill up the master cylinder reservoir, it will work for a while, but the level WILL drop again and eventually, you will have a puddle on the floor under the bike (see the article on "
ST1300 Clutch Slave Cylinder Replacement for an explanation).
Anyhow, it's not a fun job, but it's not expensive and it doesn't take too long if you've got the right tools (long handled ring ratchet wrenches from Snap-on and a 1/4" drive socket set. It's all covered in the article.
Best of luck,
Pete
PS - Please feel free to PM me if you have any questions.