https://www.manualslib.com/manual/2457401/Allen-And-Heath-Zed-420.html#product-ZED%20436
The site appears to have an 11 page service manual. You can try the link above. However, with I initially went to the primary site for the service manual, it listed user manuals and a service manual and when I clicked on the service manual, I got a scam alert that my computer was locked. I exited that and tried again and for some reason, did not get the alert again. You might want to run Malwarebytes after exploring this or do a virus scan.
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