Hi all. New here but have had 2 pellet stoves for years. My Englander 25-PC DV upper auger will not turn. I tried the lower auger wires to the upper auger and it turns,so I know the motor is good. I'm thinking a bad vacuum switch? Just not sure how to test it/them. Any help? I also have a new motor (just in case,lol) but really am leaning towards a vacuum switch. Help please!