have a sony car radio model # xrc190 need part Q3 on board,have no volume control part on board was burnt out by power ant.wire short, radio works and controls the sony 10 changer cd player but can not control the volume,Q3 on the board is the only thing that checks bad by my local repair man (TV)can you sell me the part or can you tell me where i can get it fixed or where can i get the schematics or what is the part or its values. Thanks for any help you can give its a nice radio hate to trash it.

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