The number on the switch will do you no good. It is a Carling switch but the number on it is proprietary with Monaco. Easiest way is to take the switch off, take a picture of the pins on the back and match them on Carling's site.
As a alternative, contact Northwest RV Supply in Eugene Oregon. Send them a pic of the switch via email and they'll send you out a new one. I bought a box full last time I was there as they were only $7 each.....Dennis
I just looked the switch up in my wiring diagram:
Carling Switch - #V8D1HW6B-AP100-000