onkyo tx930

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i have a tx930 which i love. i have made some modifications such as bigger, better supply caps and that did woners. i was wondering, though if anybody can get ahold of the service manual for free?? i have no money. i want to modify the bass control circuit to make the frequency it boosts lower. also i know that the potentiometers in the amp circuits are in need of adjustment (one who owned it before messed wih them). the amplifier generates a **** ton of heat and i think this is the reason. can anybody help me out?????? would be greatly appreciated.
 
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