Replaced the wax motor and despenser door assembly. The door still did not open so I called Applicance Parts Pros and they suggested replacing the electronic module. I replaced it and the dishwasher works like new. Replacing the module took about 10 minutes. Our Bosch dishwasher is about 18 years old and this is the 4th module to be replaced. Apparently the module is the weak link in the SHU5316UC dishwashers.