I have a 314 John Deere. My daughter finished mowing the lawn but left it outside. Hours later, I started it up to move it in. It would not move forward or back and the deck would not raise. I was able to push the mower into the barn, but only with it running and with the lever forward. Any ideas before I dig into this thing. I did change the hydraulic filter and oil last year and it has run fine all summer. Thanks in advance.