any one out there know much about these commercial toro mowers? Talked to Toro, and of course they want me to bring it in, I like to work on my own stuff. It has a high speed switch, which works on occasion if I reset all faults, works until I do anything to take it out of high speed then won't go back in. is there a way to read codes on the 580, or what would cause this problem to test inputs. Has a black box under deck controls but I don't see any of the lights the manual talks about. must be an older version? I believe it is a 1999-2001 model 580d two wheel drive 85 hp diesel. thanks for any help