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XLI 800 and XLS 402

Hello, I have the above mentioned amps, both with one channel out. I am a tech of 40 plus years and have checked the output and preamp transistors. All checks good. Swapped Relays and issue stays with left channel. when measuring output voltage ,, none.
So, my question... is there a resistor type fuse in the circuit.? getting 0 volts to the output transistors as well.
Thank you in advance

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