rockford fosgate T5002 problem

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problem with this amplifier T5002, the amplifier is intact, no signs of a previous repair are seen; the problem is that it turns on the ignition source, but there is no sound, probe all the source and output transistors and they are fine, but measuring voltage on the diodes I have -10 +8 volts only, measuring with the voltmeter in the central leg of the diodes and black wire on the shield of the rca, what would be the next test? Thanks in advance.
 

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