Well, I mean, if this happened because of audio tracks missing or lost, then there's nothing one could do... Remember when "its a mad mad mad mad world" was released with the lost trims? The audio and video quality suddenly "jumped" from perfect to horrible several times in the movie, same thing here.
BTW, does the 1997 version has the same audio problems? If not, would it kill them to use the 1997 version audio?