Hi everyone,
I have been looking around the schematics and I suspect the fault circuit it engaging because it detects DC on one of the output channels. My multimeter has disappeared to some unfindable location. I have ordered a new one and hope to test this hypothesis soon. In the meantime I stitched the two diagrams found in the service manual together with some clear tape and scanned them for ease of use.
In case anyone is ever looking for these, see the attached file.
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