I have this 12hp IC Briggs and Stratton (280707) two blade riding tractor made by Murray that is up in years. Worked fine last weekend, tried to start it up this weekend, no response, no engine turning, etc. I'm suspecting that it is one of the safeties not working properly. I'm pretty sure there is a switch on the seat, and also one on either the shifter or blade engagement. A quick look and I couldn't find either. Are there others? And some hints on finding them?

Is there a decent tractor manual, not necessarily for this exact model, that might have good diagrams and descriptions that might assist?