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Don't worry about replacing the choke until you know it's bad.
Heres how to test it.
There' a black wire that is connected to the filter choke that leads to the lower end of the terminal strip where the electrlyics are connected.
I can't see the other wire that come from the choke, but it too should be at the terminal strip. Mark these so that you can connect them back in the same places.
Unsolder these wires and and see if you can get any resistance between it and the chassis.
The reading with both wires off the choke should be infinity or at least in the several megohm range between the chassis and one of the choke leads
The reading between the 2 leads off the choke should be low. Somewhere around 3 to 20 ohms for example.
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