Do you mean the Signature Collection LD, not DVD? I thought the Signature Collection LD PCM for The Thing was already preserved, bit-perfect, for the spoRv project? It's listed on the first post. I feel like if it had the music replaced, it would have been brought up during the making of spoRv, but I guess it wouldn't hurt to check.
And actually, I was referring to Jaws. My question was whether the first widescreen LD of Jaws from 1992 (also the first LD to have PCM) had the music replacement or not.
(EDIT: I checked LDDB, the notes say "Top left of the jacket states: Home Video Version, Some Music Rescored." So I guess the Signature is the way to go for a PCM mono preservation. Though it would be interesting to compare the two in all other aspects...)