My B3200 HST pedal sticks occasionally/randomly. When I press down to go forward, there is resistance, and the pedal won't move forward. I can push down to go to reverse, and that will work, and then the pedal will allow me to move forward again. The pedal grease fittings are kept greased, the tractor is clean underneath, and I don't see any obvious physical obstructions. Could the pedal damper be sticking? Messick's has them for $200 so I want to be as sure as I can before I throw $200 at it, and I'm not overlooking anything. Tractor has about 660 hours on it.