I get asked this question a lot. So here's what I would recommend. First things first, try contacting your manufacturer. A lot of manufacturers have their own authorized service technicians. And since they're the one that manufactured the appliance, they're usually the ones that know it the best. If your appliance is under one year old, it's still probably covered by the manufacturer's warranty, which means if you get it repaired through them, chances are you're going to get it repaired for free. And even if they don't have their own service technicians, they can usually point you in the direction of one.
If that doesn't work, you can Google the phrase "appliance repair" plus your zip code, that should come up with a list of appliance repair companies in your area. From there, make sure you read the reviews just like you would with any other business. Before you call, make sure that you know your model number and your serial number, if you're able to find it. The most accurate one is going to be located on a sticker somewhere on your appliance. So make sure you look for that. And when you call, make sure you're as specific about your issue as possible, that way your service technician can try and get the necessary parts ahead of time. Meaning they're more likely to fix the problem on the first visit.