X2....if air leaks out with the valve train on...then the valves have to be open....valves are not stuck open because it seals with the shafts removed. You should be able to see this in the preload and/or with your eyes (watch the springs for movement as well as the lifter) as you tighten the shafts down while those cylinders are at tdc.

While you are at it, check the the preload on a couple of other cylinders to make sure it is not borderline excessive for the heck of it.