A campaign has been issued for defective or faulty air door cylinders. The rubber O rings inside the piston are said to bind and catch which can cause the door to jam in the closed or open position.
The new cylinder is on it's way, but in the mean time the bus may not be used.
Thank you Eric for mentioning this.. totally forgot about P081. You'll have to use P016 or SP103 if you had plans of using P081.