Brian,
You obviously had too much time on your hands owing to hydraulic flushes, but a useful little ditty.
AA62,
The reasoning behind the method of lowering the door was that if you powered it UP then you pressurised the lines that would become the DOWN lines on release of the lock. That way you didn't get the rapid and dangerous decent of what could be a very heavy article dependant on how much sh*t was in the door stowage bins.