Once you lock do your solenoid and lines stay pressurized? I ask just to eliminate the possibility of having a bad solenoid and a leak somewhere beyond compressor.
As far as removal (if they have used the mounting kit that came with the compressor) there is one bolt on a single metal band that you can loosen and slip the compressor out of, while leaving the mount in place. It is perfectly possible that the tank seal is leaking near the bottom, but with that kind of leak you should be able to hear where it is coming from. Good Luck.
[b][url="http://www.sundawg.net"]S u n D a w g[/url][/b]
'97 Jeep TJ Sahara Edition
-[i]RE 4.5" Lift[/i]
-[i]BFG KO 33x10.5r15 on AR-767 15x8[/i]
-[i]Tom Wood's Conversion Kit[/i]