I have a 34Z commercial zero turn I brought it in for a simple service, filters changed blades ect. When I got it back I immediately had a problem with the steering the right side feels unresponsive when I pull back on the right side lever it spins the tire leaving scuff marks. I've had this mower four years never had this problem but have had repair issues with the dealer mechanics. Wondering what the problem with the steering could be any body know