http://paintballcompressor.com/ is owned by Shane's brother, Shawn. They have the rebuild kits for the Kalibur fill stations. It's also where I get most of my compressor-related stuff. Good people, good service.
I can almost bet that it has a piece of o-ring stuck in part of the valve. There are 5 o-rings on the shaft that need to be "new" and well lubed. Pull it apart and check for pieces. and clean the little ports. Of course, I have the ultimate fix.
ya i was having the same problem with slow fills. it was a small piece of o ring stuck like he said. i'm running 2 fill stations non-stop on any given saturday or sunday. i lube each fill station at lunch then at the end of the day. i've had to replace the orings 2 times on each fill station. great little fill stations, gets the job done!