Bally Solved Eight Ball Deluxe Limited Edition (Bally, 1982) Schematic Reading?

[nwkadm]

I have an EBD LE and am trying to understand how to read the schematics. I have attached a screen shot of what I am talking about.

I am trying to figure out what the numbers on the left hand side refer to?

Any help is appreciated.

BTW - this is from the Playfield Wiring Diagram.

Thanks

 

[pinballdaveh]

Those numbers refer to ballys wire color code. The first digit is the wire main color and the second digit is the tracer color. The color code should be.
1 red
2 blue
3 yellow
4 green
5 white
6 brown
7 orange
8 black
9 grey
0 no trace