Snow Blowers

I have a 10527SB-LS bought in 2012 with little use and have noticed that the auger housing is not parallel to the ground. I had this problem on my old Ariens when one tire was a bit low, but on the new machine I have pumped them both up to the factory 20 psi and one side is still a good 1" low. The skids are both set to the same location on the slots and one skid is 1" off the ground. Is the auger level adjustable in some way from the main frame or is it fixed? I can't imagine that the mounting hole location would be wrong on a mass produced piece like this.