Rockford Punch 45 no sound

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Hello everyone I have an old school punch 45 that I've had for years and I would like to repair it.I have no history on it because it was given to me about 16 years ago or more.I have tested it and it powers on the led turns on but it makes a busing sound I don't know if this is normal.it there schematics or voc check somewhere? Any help is appreciated.
 
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Does it produce any audio when you connect a signal source and speakers?'

If not, do you have positive and negative supply voltage on the power supply pins of the op-amp closest to the power supply?

Noises from the board are rarely a concern, especially when the amp isn't drawing excessive current.
 
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