If I rememeber my consoles, Key 9 would be a part of the rows to the right of the main ICI field. The center row of keys, above the volume control, are the main ICI keys, the next row to the right should start at 0 on the bottom and work their way up, then over. I could be wrong on this as well.
One way to figure it out would be to print out all the keys and see if you can find a labeled that matches what is configured. Then work your way back or forwards. (One thing I just thought of is see if you have a key on the console labeled TONES. That was a popular way to explain to operators what the key did.)
Hope this helps,
Scott M.