It maybe leaking between the solenoid and the body it self. A b2k is not hard to take apart and put back together as long as you are careful.
Just take the frame off carefully.
Then take the tray off.
Underneath the tray is the solenoid which is attached to the manifold which is attached to the body.
Apply some lube between the solenoid and the manifold, and same for between the manifold and the body. Just put a thin layer of lube on the manifold itself and put the solenoid back on.
Manifold = silver metal piece.
solenoid = white/black plastic looking thing.
Let me know if you need some photos, i have one of my B2k apart right now so i can take some photo.