I think you are correct. I would do some time testing first. Work the boom several times and time the lift stroke to get a base line on its speed. if it gets in a streak of drifting down, stop it part way down with a high lift jack, cherry picker, or chain fall to a beam. then remove and cap the lines going to the cylinder/s. now manually lower the boom, and if it is good internally, it will just move a little and then stop and stay put. If it drifts down, even a little, the piston (in one or the other cylinders) is bypassing. Simple, rule out one of two possible issues using the least difficult method. Jim
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