First of all, is this one of the newer models that has the firing pin mounted in the frame, or an older one where the firing pin (called a "hammer nose") is attached to the hammer?
If the hammer is falling, but no dent is left in the primer, the most likely causes are likely related to an issue with the firing pin/hammer nose, or the hammer block that prevents a discharge if the revolver is dropped.
While it is not difficult to remove the side plate, doing it incorrectly can ruin it, and after you got it off you might not be able to diagnose the problem anyway.
What you can do is open the cylinder, hold the cylinder bolt thumbpiece in its most rearward position, and double-action the trigger and hold it fully to the rear. Then while holding it in place look and see if the firing pin is sticking out the breech face. If so, slowly let the trigger move forward and see if the firing pin retracts back into the frame. If all this works as it should the problem probably isn't the firing pin.
Last question for now: Has anyone done a trigger pull/action job on this revolver?