The description of the problem and the steps already taken to diagnose it are very good. I regret not having any further suggestions for finding and fixing the underlying fault.
Quote:
Originally Posted by diverson
...the 6V PWM bus was reading 5.8V.
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For anyone worried about the apparently low voltage, it is normal when the 6V bus is unloaded. There's a diode in the supply output that prevents backfeeding; it is bypassed with a FET when enough current is drawn. The voltage then rises to nominal.