Rockford Fosgate T5001bd No sound

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Hi, Working on a Rockford Fosgate T5001bd. Called Rockford to check on schematic. Still in production so they won't release it. The amp has sound with the infrasonic switch on. No sound with it off. I suspect it's an op-amp. Not familiar enough with this model to know which op-amps control the infrasonic circuit. Anyone have an idea or schematic close enough to be used to trouble shoot this problem?
 

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