Doh! I was at the wrong friggin' door. There was one door that had a lock (that blends in very well with the back ground texture) that I was mistaking for the door where the Lich was.BTW, I did change class, drop everyone, so my warlock->bard-become-ninja would get all the experience for all kills. Trained him every level in locks and traps, for 4 levels (he went from a skill level of about 4->8 in no time ... ran over, picked the lock ... found it was the wrong door ... DOH!
So, reloaded the more recent save, back to the castle, at the door with the music ... used the key .. et Voila!
Now, the search for the relic and "bad" vampires ensues.
Tools for Wizardry(r) 7