Well we have lots of snow here and went for a long ride yesterday, about 30 miles out I started to notice belt slipping and smoking but we kept going anyway,it was storming bad with lots of snow,when I got back I pulled the side cover and saw oil on the belt and clutches and all over the pto side of the motor,upon inspection I see a what looks like a black plug on the valve cover gasket blown out and the oil is leaking out there,what would cause that? how hard is that to fix? also now it is showing a code 84 and 42 that just sarted while it was in the shop,thanks.