Get your tools out again buddy...
It'll need a light coating of grease to help the seal. It should stop the leak if that is where it's originating from.
Poppets may leak a little from time to time until they're fired a few times, it can help to put a drop or two of oil into an ASA (please don't put oil or grease near your bottle's fill adapter), air the marker up and dry fire a couple of times. This distributes the oil through the marker starting with the HPR, then LPR and on to the solenoid.
If you put too many drops however, oil will end up in the barrel and will screw up your accuracy.