Garage Door Repair, Installation & Replacement in Walnut, CA Once your garage door is installed, it seems as strong as iron that will never break down. However, after a few years of being used regularly, different parts of the door stop functioning properly. When this happens, the door becomes a big security threat for you. Therefore, you should hire the best garage door repair Walnut services. KARLO Garage Doors and Gates is the number one garage door service provider in Walnut, Yucaipa, La Verne and other adjoining areas.