I drove the mower into the garage after the last cut a few months ago. I went to the shop today to replace the deck belt because it popped off during the last cut. After replacing the deck belt and starting the mower it would not move. I checked the neutral levers in the back, put them in both positions and moved the steering arms and nothing happened. The mower drive belt is still in place. Not sure what to check from here. I did notice that one transmission, the right one was not pulling as good as the left one last fall, but not sure why I can't get it to move now. Any suggestions? Thanks