Ok, here is what I found... The part number IS #163858811..the problem is thats the part number for the power ic board that is discontinued and I cant find anyone that has one in stock. The problem now is there is a 3" wide black colored part soddered to the board that is marked stereo amplifier w/ a #STK4221V as a number. This part mounts directly to the massive heat sink inside the stereo. Im guessing this is the part I need and not the circuit board it is mounted to. My next question is, is there any aftermarket replacement for this part and can I soder the old one off and the new one on?

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