I recently purchased an older model Esp19. Everything operates on it perfectly. However when the machine is turned on the pump motor stays on and continues to run. It is running at full speed and operates correctly. At first I thought it was something in the joystick that didn't allow it to shut itself off after performing its task. The machine continues to run constantly in upper and lower control modes so if doesn't appear that its something in the joystick module. All of the turning and movement functions perform correctly. Any input would be appreciated. A friend said there is a relay that controls the running of the electric motor that may be stuck. He also thought it may be an issue with the control board. Any help would be greatly appreciated. Thanks. Brent