No idea but don't want you to feel ignored
check with
Hans Moust at http://www.guitarchives.nl/guitarsgalore/parts.php
and
Ken Nash at http://www.theguitarmechanic.com/GuildTuner.html
is it the low E string? its ok if you have to replace a tuner. just have to find the identical Guild one to replace it.
Hans comes through!
nice!
Hans is the author of the Guild Guitar Book, which you may already know.