First gather the information recommended in the What to Do When Something Breaks sticky thread.
http://www.hometheatershack.com/foru...ng-breaks.html
Look in the Manufacturer and Vendor Reference Information forum
http://www.hometheatershack.com/foru...ce-information
for contact information for your manufacturer.
Look for authorized service centers (ASCs) for your brand first. They will not always be the best servicer in your area, but you should check them out. If the product is under warranty, it will be necessary to use a servicer that is authorized by the manufacturer. If not, ASCs often have access to information that others do not, or at least have access to it more efficiently. Don't be afraid to ask lots of questions, such as how familiar a servicer is with the brand and model.
When you are choosing a service center, be sure that you understand the servicer's policies and procedures. Ask some of these questions:
Are there estimate charges up front? Do they apply to the repair? What information do you provide in the estimate, such as specific parts and procedures, breakdown of parts and labor?
How do you determine labor charges? Hourly rate? Flat rate for certain repairs?
What is the time expected to first evaluate and then repair the product?
What kind of experience and training does the technician working on the product have?
What is your warranty on your repairs?
Not sure what to do? Not confident in the answers that you are getting? Do your homework as suggested in these threads and post a question in the forum. Include as much information as you can about the product, the problem, and what you have done to get a solution. Someone will likely be able to offer advice.