Trace elliot ppa 600

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Please some one help me i have a trace elliot gp 12 smx going into a trace elliot PPA 600 power amp and tonight one of the chanels started to distort all the time and not as loud as other chanell i have tried all new leads and have narrowed it down to being the the PPA 600 on chanel B as chanel A working well please any advice does this sound dead or repairable
 
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