Rockford Fosgate t600-4cpbd

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I have an audio issue I can not seem to solve. The amplifier when I bought it had a working power supply and two shorted outputs. So I replaced them. The issue is static audio. It unclear and the frequency dial seems to not do anything. Q15-q14 I do not believe are working at all. That channel does not even display the 50hrts at the speaker terminal.
 
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