This all started last week when I clipped a small stump and bent a blade. I replaced the blades and torqued to 85lbft(specs say between 70-90 lbft). I started to mow and the mower blew the 20amp fuse. So I replaced it and thought that maybe the blades were too tight. Retorqued them at 70lbft and the everything was gravy for about 20min when the mower deck just shut off. When I pull the PTO switch now, nothing happens. Is there a relay for this? Any clues as to what could be wrong? Clutch maybe? The mower is 2 months old and only has 9 hours on it. Should this be covered under the warranty? Thanks.