I remember it was in a HTF thread about Steve Sansweet's most recent non-info about Star Wars on blu-ray.

An interesting thing in zombie's article is the quote that the IP was scanned to replace certain damged parts of the original negative. Didn't Lucasfilm later (in 2006) claim that the IPs had been somehow physically "stripped for parts" or something for the SE, making them unusable for anything now? But if the IP was merely scanned and not cut, couldn't they just use them again and clean up whatever has accumulated since the last time they used them (1993 I guess)?