Seattle audio and video technician Todd Mueller showed up last year for what might have been a routine job except for one thing: Amazon.com Inc was taking notes. As he mounted a flat-screen TV on the wall, an Amazon employee studied how he covered his shoes and used a blanket to protect the hardwood floor.After at least two years of study, Amazon is ramping up efforts to offer repair, installation and other services online, tackling a fragmented but potentially rich U.S. market that may be worth an estimated $400 billion.

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