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Doing so will void the warranty. The inside of the unit contains no user serviceable parts. All servicing should be performed by qualified personnel only. 2. If you need to exchange the unit, please return it in its original carton or other suitable box, with a sales receipt, to the store where you purchased it. If you are returning the unit more than 30 days after the date of purchase, please see the enclosed warranty. 3. For service information, please call 1-800-253-2764 or visit our website