Paradigm PW-2200 Sub Amplifier Hum

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Hello everyone, I have 2 paradigm PW-2200 subwoofers, and one of them has a hum coming from the amplifier. I pulled the amp off of the back of both of them to compare for any sort of damage in the one with the hum, but found no burnt components or bulging/leaking capacitors. I did notice, however, that one of the feet on the transformer in the humming subwoofer was bent up and not attached to the screw beneath it. I am not sure if this was some sort of weird factory bandaid, or if the previous owner did this for some reason. In any event, I am trying to figure out what is causing the hum in the one amplifier and not the other. The hum is coming from the board directly, and I believe it to be from the transformer, although I am not 100% certain.
Any information on where to start or what to do would be greatly appreciated. Thanks!
 
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