i have a 29 hp 61 inch turf tiger. the crew brought her back to the shop broke and i cant figure out whats wrong. you pull the blade engage and nothing happens. i took the panel off replaced the switch and figured that was the problem. still nothing. i checked all the fuses on the on machine. put her on the lift, checked out all underneath the machine and checked all my belts. couldnt find any interlock messed up or anything. maybe the clutch itself is shot. only have 400 hours on the machine. anybody have anythign else for me to check before i bring it in to the dealer?