Actually I did find a source for the CS4231A-KQs. There may be minimum orders involved, but they don't have that many anyway. We may become the only source for Empeg replacements! If you would like us to replace the chip, PM me. We can do all the other repairs as well. 100 pins of fine SMD work is not easy, but we've worked with similar pitches before.

Stu
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If you want it to break, buy Sony!