Help with Schematic for Carlsbro Gamma Sub

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Hi Guys
Can anyone help with a schematic for a Carlsbro Gamma active sub. I have 3 in for repair. All have similar faults in the filter section, the power amps seem ok. The signal is ok through the input buffers then gets lost somewhere in the filter stage.
Will be most grateful if anybody can save me hours of work.
Dave
 
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