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Thanks to the excellent investigative work of Mr. OJ Dorson, I was able to fix the XLR output.

It was as simple as replacing the chip (which is an OP-AMP), see the photos for part number (the top line of the P/N is what matters).

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Love a happy ending.   Love a community that helps each other.

If you are getting output from the rear sockets the XLR out is the issue and can be either the transformer to the DI or a connection around it.