I added a comment, in their forum, about discharging the capacitors:
"120 Vac is actually 340 Volts, peak to peak.
To discharge a cap, use a resistor.
Selecting a resistor, note that typical resistors are rated 1/4 Watt, use this equation:
P=VI
V=RI (aka I=V/R)
so
P=V^2/R (aka P/V^2=R)
where P is power (in Watts), R is resistance (in Ohms), and V is the voltage.
Assuming a 1/4 Watt resistor, V=340, this will give you an R of 462K Ohm, which will release a current of 0.002 milliamps (if my calculations are correct!). It could take a while... then you'd have to switch to a smaller resistor, as the voltage drops...
This would be much easier with a 5 Watt pot."
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