Mackie SWA1801Z amplifier board

Hi everyone ! I have a problem with the amplifier of a Mackie SWA1801Z subwoofer! it does not have damaged transistors or mosfets, but the delivered power does not correspond to the characteristics and the output signal has a crossover distortion at low volume. Another strange thing is that if I try to send more input signal the output signal does not increase and the output value does not exceed about 30v RMS. Is it possible to have the wiring diagram? Thank you and good job to everybody
 

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