Ds18 china amps

Hello! Please help me to identify the value of a zener diode dz11. A 6kw mono amp. Thanks...pls see attached image.
 

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No, I do not have the schematic. I have a similar board the zener diode is a 1n5231B (5.1v).

Can you help me identify a transistor on the drive board? Q4 (circled) top right corner between Q1 and Q10
 

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