I have a 2010 ZT ELITE 60 that in the last couple of days the pto won't engage. I've checked all connections n no corrosion. Everything looks good. I was mowing yesterday and and cut off for no reason and I left engine running and just barely touched wires coming from pto and it started back no problem. I just wondered if my pto clutch could be wearing out and causing this? It's a 2010 model and I've kept it serviced regularly. Any thoughts on what else I can check would be greatly appreciated.