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I'm not sure what type of zener diode this is. What I can tell is that it is either w15 or 315. I have 2 photos of the part in question. I have found that the one in question is shorted.
Possibly a 15V zener diode similar to HZ15-3L, but it would be better to trace out the circuit. Putting a higher voltage than original zener diode in a circuit could cause damage.
Required, but never shown