ESB P&S 1425-84 is now available at a.b.sw.
At this point, it seems it may be awhile before ld-decode can handle digital audio although Happycube is still working on it and seems to be more and more hopeful with each update.
For the time being, I believe I will capture the video with ld-decode and use other sources for the audio. Thanks to people like Schorman and Hairy_Hen there are many sources available that are gout sync'ed already. Schorman's laserdisc audio archive contains bit perfect audio for many of the exact ld's I'm trying preserve so most of the time the exact audio I need would be available.
ROTJ 1478-80 is next.