Am trying to troubleshoot my Honda HRR2169VYA lawn mower. It will not move forward. Is there a button I need to push (other than the Smart Control Drive) to make this lawn mower move forward? I press on the Smart Control Drive bar, but nothing happens. I literally have to manually push the mower, and although the mower itself is not that heavy, I have to force the mower...It seems stuck, but there is nothing caught in the wheels. Please provide any suggestions.