Adam, I have that sound module, if you need. I think the 25EC58 was the only set to use that module. I ordered a few extra new ones when my mother was using my Zenith in the 80s, and would blow up the audio module by having the volume out of control.
PM me if you want me to send you the module... I don't know if I can lay my hands on a new one at this point, as I have parts stashed everywhere and it's been 25 years since I ordered those new ones. I do have a few known, tested good ones.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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