Rockford Fosgate Punch 250M2

Do you know if this was done at the factory or someone’ else’s mod ?

A cap between R20 and and pins 9 and 10 of the lm339
 

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Is there a reason that both leads are not soldered to the board on this thermistor ?

It appears to have never been soldered even from the factory
 

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Is there an easy way to check the components like voltage wise or do I have to ohm everything out I’ve went through the channel and everything is testing good but I know a transistor or resistor is bad or both . Since I get very distorted output and e channel will not bias