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Digipro 1000 amp

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hdelektronic picture

Hello. I’m new on forum. I have blown amplifier digipro 1000 from DB technologies. I found some bad parts, but cannot identify this diode. It has marking 31. In wiring it is d12 and d13. Scheme is there:

Thank you in advance.

Kari picture

Ahoj and welcome here!
It must be a transient absorber around 15V_or a simple Schotky...
(BTW, if they are not all defect-measure the good ones characteristic)
Regards, Kari