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No output to speakers 3,4,5 of panasonic SB-WA15

Is some one able to help me with schematic diagram of panasonic subwoofer SB-WA15? Any help will be appreciated.
thanks

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Have similar problem on a Panasonic Tau model CT-27SL15.
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Panasonic Service Manual
http://dl.dropbox.com/u/35219914/PANASONIC%20CT27SL15.pdf
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