Re: Aurora fault.
Just to chime in:
If the modulated output is working properly than the line level driver must be in working order as that's what's used to drive the modulator. There is a 75 ohm terminating resistor in series with the jack that could conceivably be bad. It would be worth a check. If it checks out good as does the jack, then possibly the cabling or device it's connected to is presenting the fault.
Darryl
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