TLX PS10 Subwoofer

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I have a JBL TLX PS10 Subwoofer with no sound comming from it I have dowloaded the service manual with schematics. The area appears to be in the amplifier section the test voltage that I am getting at the K1 relay is supposed to be -540 mv I am only reading half of that any ideas, I still have not checked the transistors to see if they are shorted as that requires removing them from the circuit.
 
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