PARAJUST VFD part identification

Hi everyoneAttachment 8857Attachment 8858Attachment 8859!
I have accidentally damaged the ORAC's Parajust VFD .
I was trying to connect a low frequency choke to the power supply output without the use of proper socket connectors and the wire touched the Parajust control module, part of which is shown in the attachments.
The circuit image is an extract from the pdf manual but it was not readable.
Does anyone pls know the value of the Zener pointed by the arrow. It controls a 3 Amps 40 volts NPN transistor. The General Electric<D42C3>

Any help appreciated.

regards