Mowing yesterday on a slight incline and it felt like the pedal disengauged and went to the floor. The mower slowly started down the incline, brakes worked fine and the mower continued to run. I haven't had a chance to remove the deck to check but thought I felt some sort of belt going from the back (transmission) to the front. Is there such a belt and if so, can I replace it myself. THought this was a good place to start. Thanks