There's a ring clip on the underside you flick out and the lot come out same as a corny.@KegLand-com-au
Are the poppets in the stainless steel carb cap replaceable? i bought a couple of caps a few weeks ago now and first time i used one, there is a slight leak, probably a dodgy o-ring, it happens.
I have a few new poppets in a corny keg kit i bought ages ago, would be easier than sending it back for replacement.
Can be a pain to put back together.
Get a spare ball lock and a short piece of hose and try and back flush it with hot water as sugars are probably clogging it and stopping it from closing off.
I always back wash mine with cold water since it happened to me and leave the ball lock on to let it dry out and all have stopped playing up since