darth_ender said:

My understanding is that the redub was not JEJ recording a new line, but rather a discarded line originally intended for ANH.

http://filmsound.org/starwars/starwars-AQ.htm

I will always call BS on that. No one uses the word "stardestroyer" in the movie, and Vader never left his ship that he would need to alert it to prepare for it! He starts on the SD, moves to the Blockade Runner, is on the Death Star, then on his TIE Fighter. Where would "Alert my Star Destroyer to prepare for my arrival" fit in? When he left the Blockade Runner? I know the rough cuts were long, but that's ridiculous.