For the second time, there is a mono mix of Empire Strikes Back that is not a fold down.
Several lines are shifted (“The 1st transport is away!”) some are added (C3pO’s lines when entering the hibernation chamber) and some are changed (the stormtrooper when 3PO enters the wrong room at Cloud City).
This can be found on Despecialized as the 16mm Mono.
And I assume Puggo Strikes Back? I evidently missed that discussion and have not seen anything more recent on it. From the sounds of it, it was a mono remix, but has fewer differences than the ANH mono mix. Just some things to make it sound better.