Digitizing a VHS (TWC323) and came across a Dateline News report (1997.01.31) on the SE which as George Lucas saying:
Jane Pauley: 'George realized his old classic creation, had lost some of it's glow'
George Lucas: 'and so we replaced 375 shots, just in Star Wars.'
Don't remember hearing a number before. And not sure what 'replaced' equals.