Norcold Refrigerator Help Needed - Won't cool at altitude

I would be surprised if the gas orifice actually needs to be changed. I have the original orifice in my norcold and it works fine from sea level to 10K feet. I live at 8500Ft and most of my camping is at that alt or above. Can you see or hear the flame? could be as simple as the ignitor not working properly. Is it possible that there is a piece of insulation in the flue? I would check those items first since there easy and free.