I think it is in the manual, i dont have one handy right now.
Set your meter to resistance. Measure across the outer leads (typically) and you should get the value of your pot. It is probably 5k from memory.
something like...
Check how it mounts, i forget. You can also put this pot up in the cabinet. or just eliminate it and go across the pins on the volume plug. Some boards came with a jumper plug to do just that when they where already in the cabinet.