2011 GR 2120. First time it stalled 10 amp fuse was blown. Replaced fuse and it worked for about an hour. Replaced PTO switch. It still stalls out after blade lever is engaged. Use jumper to by pass seat switch. Still stalls. replaced seat switch worked about 1 hour then stalled out and continúes to. When it starts to stall if you quickly put foot on brake it continues run including the mower but you can’t mow with foot on break. We are stumped including my local dealer. Help please. Thank you. Walker