If the orfice is clean, unrestricted and it stays on pressure with lever in any positon like you say and arms are moving like they should, then you are going to have to take the unit apart and get at the unloading valve inside. Made darn sure that orfice is open though, cut end of screen off so you can clean it good and just wrap it back up to close screen. If jiggling those levers back and forth a little allows you to come off pressure then the problem may well be stick lever, I doubt it though.
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