Ask to speak to a technical support person, they seem knowledgeable and helpful. Shortly after I got mine 3 1/4 years ago, I had a stripped nut holding a blade on -- found it when swapping bagging blades. They FedEx'd one no charge. Unfortunately, recently I experienced the blades spin but no move problem, plus white smoke pouring out of left side. Black 'goo" was oozing out of the controller. Ryobi provided me with parts list and troubleshooting info. Since out of warranty I had to pay for controller myself (shop around, prices vary widely). I replaced the controller, it no longer smoked, but got a constant beep. Replaced the seat switch, no longer beeps, but still wont go. Traced it down to the drive motor -- Motor OK, but there are 3 Hall Sensors on a PCB, basically the equivalent of brushes that are used on brushless motors. Found out you can't buy just the drive motor, you have to purchase motor and whole differential. P/N's on hall sensors and PCB were useless (even had a friend fluent in Chinese try to determine a manufacture). After spending nearly $500 and countless hours, I determined it wasn't worth the additional cost plus looking a another $800. in batteries in a couple of years. It was good while it ran, but i am now parting it out on ebay.
Sorry for the long response... Just had to vent a little to.
Sorry for the long response... Just had to vent a little to.