Ryobi RM480e / RY48110 Riding Mower Drive Controller troubleshooting diagnosis and replacement

Shortly after I replaced the batteries in this mower with LiFePO4 (in a prior video), the drive controller failed. It failed after I drove the mower a short distance, parked it for a few minutes with the unit still on, and when I got back on the mower and pushed the accelerator pedal the mower did a small lurch forward and the whole unit powered off. Turning the key off and on again did nothing. I had to disconnect and reconnect the battery connector to get the mower to power on again. The blades would still turn on, but it would no longer move. The back-up beeper would no longer operate when the switch was set to reverse. The drive motor was left in an engaged position that made it difficult to push, even if the battery was disconnected. In this video I remove the old drive controller, troubleshoot/diagnose it, determine it's faulty, and replace it with a new OEM unit. The part number for the drive controller is: 996508001 - DRIVE MOTOR CONTROLLER