Legacy LA470 repair help

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The first time the amp was ever hooked up, the polarity of the power was wrong(dont ask). No fuses blew , which i found strange, and smoke came from the LA470.
The LA470 has some sort of protection circuitry and a red LED lights when active- this LED is now permantly on and i cant disable it, theres no reset. Chances are the amp is fried somehow and thats why its staying on, can any one help!?
 
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