Your problem is most likely where the cylinder / head come together. In the Hitachi framers, the cylinder is designed to move up and down (unlike Bostitch where the head valve moves) so if the O-rings are dirty or broken, or the spring under the cylinder is broken - the cylinder won't make a good seal to the head valve.
You can try plugging the tool in and giving a couple of firm taps straight down on the head with a rubber mallet - if the leak stops or slows you'll know the problem is with the cylinder movement.
Check the head valve seal - often they get sand / debris embedded in them which prevents the cylinder from making a good seal.
It is rare for a Hitachi trigger to be a problem.
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