We called Ralph's Appliance Services for a dishwasher repair. When they first came out, they could not find the solution and they took it back to their shop. They worked on the dishwasher at their shop and when they brought it back, it was functioning again.
I was very happy with them, based on the first job they did for us, which is why I called them back when the refrigerator needed to be repaired. And, I will call them back again any time I need to. They're very professional, arrive on time, and are the absolute epitome of what you want from a service organization.