Wiring

What is needed are the numbers associated with the unit. You will need the brand, both model and serial (if it has one). Then the board needs to be described in detail, size, and so on (possible numbers on the board as well, may help).
Go to the Internet and search for your model you have, asking for the circuit board information. You may be able to find a repair or service manual for this unit on the NET.
Search for "service manual" or "repair manual". One of those will bring some results.