AC,
that chimes with my recall of the sequence but was unsure enough not to say so. The Lockheed tech bulletin you linked also contained an article on the cargo door. I do not recall any snagging on the control cables but on the 'K' you could not close the cargo door by selecting 'closed' on the switch. The drill was to select 'Open. and when it had risen out of the uplock pull the emergency release handle. Any other method would usually result in a very fast freefalling cargo door and damage ! On opening in the air it was common to have to bunt the a/c slightly to ensure the cargo door entered the uplock.