You might receive more help if you post the model number as well. Most consumers would not recognize a chassis number but may make a connection with a model. There are a number of suggested sources for service manuals in the DIY Repair stickies and the Vendor Listings.
STK391-020, IIRC, but these were not a high failure point. There were other issues in those sets with some of the related components. Don't jump to the conclusion that it is an output IC problem.
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