In order to repair a KitchenAid blender, you must first determine the part that needs repairing, find a replacement part and, depending on the manufacturers specs, replace the part with the help of the KitchenAid guide on their website.
KitchenAid's website offers a section where you can determine the part of your blender that needs fixing based on the model. KitchenAid provides useful diagrams that break down the blender into attachment parts and unit parts. Once you have selected your model, you can see all available parts for purchase and replacement. KitchenAid offers parts for more serious repairs such as the drive coupling and some simple items such as rubber feet.
If you are unsure about which part is causing the problem, KitchenAid has a troubleshooting guide for each blender listed under the "Common Symptoms" tab on its website. There you can choose the current problem with your blender and receive the parts that are most commonly the cause of that specific problem. On the same page, under the "Installation Instructions" tab, you also find specific instructions on how to replace the part that has broken on your blender. Every repair part sold by KitchenAid has a 30-day money back guarantee.