The board appears to be working, and I can hear the solenoid clicking away. After removing and lubing the tube and pin, replacing ALL o-rings, it will fire once or twice and then seize. It's been a while since i've aired it up, so I can remember if it locks forward or back, but I believe it gets stuck in the forward position. It routinely shears one of the o-rings when this happens too (also...cant remember which one exactly.)
Does that vague info help at all?