Some teenagers helped me mow grass, but they didn't follow my instructions on how to start my John Deere. I caught one of the teens "Kick starting" my tractor. He was kicking down on the emergency brake on the left side...like it was a motorcycle or something! Now the blade won't turn. He said that a "cable was loose" and that's why the blade won't turn. The lawn tractor is only a year and a half old and I just had it serviced at a John Deer dealerships three months ago. Now what>?