I was using my 331 for the fist time in 3 weeks yesterday and noticed that the fast speed wasn't what it should be. I figured it just needed more time to warm up. When I was cleaning my tracks out at the end of the day I noticed one track was changing speeds no problem when the button was pushed. The other side stayed at a constant speed. It was faster then low gear, but slower then high gear. I hate to sound naive but does anybody have any input on what I'm getting into? I've a few more trees to plant tomorrow with it and then I'm bringing it back to the shop. Any ideas would be great. Thanks, Marc