Hey guys... I just discovered this site. I have been having trouble with the U-Control Wall-E, I'm not sure what to do and I was hoping that someone here would have a good suggestion. Sorry if this isn't the right place to post this but here is what is going on.

The left side will not move when I have the treads on. The robot used to work perfectly, then I didn't use it for a while. I turned it back on and noticed that he only pivots in place due to the left side not working. I took the rubber treads off and the wheel seems to turn but when I put the treads back on, it stops. I replaced the batteries but it still doesn't work correctly.

Any suggestions would be very much appreciated. Thanks in advance.