Nearly new Kubota ZD 331 and the right transmission is very weak. After starting, it will not move the unit even at 3/4 throttle. You can tell the engine is loading and there is very noticeable "whine", but no movement. I have to use the left wheel to get things moving. It seems to get better after running a while. Any suggestions? I will be taking it in later in the week for some recall items. Has less than 100 hrs on it. I hope it is not a pump/hydro issue. That is why I traded my ZD28 in on this one.