I am a newbie and need troubleshooting help. While using 521 today I hit some dirt and rocks, heard what I thought at the time might be a shear pin snapping as blower stopped blowing. After melting all snow and ice out of blower, I cannot manually turn either the auger or the impeller. If it was a shear pin wouldn’t one or both of the auger blades spin easily? The shear pins both appear to be in place. The auger blades just rotate by hand a little bit in each direction. The impeller does not move at all. Am I in big trouble?