My PWT died.
2 of the 5 voltage indicator LEDs were out. Problem turned out to be an intermittent connection on a voltage regulator. Resoldering its leads on the bottom of the power supply board cured the problem.
However the fuses threw me a curve in the troubleshooting process.
It appears that one of the fuses only goes to a connector with nothing plugged into it.
I assume this connector is used on the PWD and is not required on the PWT?