My FSA IS-2 supposedly sealed bearing threadless headset has been leaking some brown liquid out around the top of the head tube. It looks like thick rusty water, but could be a dilute grease or something. The frame is titanium and the fork is carbon, so neither of them should be rusting. The headset bearings seem perfectly smooth and solid. The bike is not quite a year old. I haven't been riding in the rain or wet, other than the occasional puddle. Could be sweat, I suppose, though I don't know how it would get that much inside the head tube. There is enough of the liquid leaking out that it was dripping off the frame onto my knee and leg. I suppose I should disassemble the headset and see what's going on inside there, but this seemed rather odd to me. It doesn't seem like there should be any liquid inside there to run out. Has anyone else seen this? Should I be worried about the bearings?