I can't help with the wiring, I am afraid. I have never disassembled mine. Besides, mine is different model so maybe the wiring is different too. One way to tell is to get a small battery, 1.5 volt should be enough. Connect it to the wires you want to check (don't worry about positive and negative) and you should hear a pop from the corresponding speaker(s). Just a thought, are you positive the centre speaker isn't turned off or lowered down from the menu? There should be a hidden menu, from you can control the surround levels, level of centre speaker and so on.
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