Paul Revere Revolutionary Service was here recently to service one of my Mitsubishi split units. I have two of them, and they are each about nine years old. They have already taken care of the one upstairs for me. When the downstairs one started acting up, I called them. They came out promptly, and took some measurements, and decided the bushings had loosened some. So they replaced the bushings, and added some coolant to it. Now it is blowing cold air, too! They are a good company. Their employees are friendly people, and they do good work.