I have a used MC FL-400s that I want to cut open to determine if the ADBV was bad or failed.When it was removed from my engine my friend just let the excess oil flow from it then I boxed it back up and have kept it upright since then.Before I cut it open should I be able to see oil in it,still? When I do cut it open should it stay upright as i'm cutting it? After cutting it open is there anything in specific to look for? Of course I will be taking pics at each stage.Any advice is greatly appreciated.