Inductor sparks along with bass?

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Alright, so I'm trying to fix a MTX jackhammer jh600 that broke down on me.

I found a bad output mosfet and ended up replacing all of em' and a few other parts. Now it works, but barely. The output seems pretty quiet for what it is, and after about 10 seconds the inductor starts sparking along with the bass and overheats shortly thereafter. From the look of it, it was doing it before it cooked itself.

Does anyone know what the hell could cause that?
 
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