Looking for a car amp schematic

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Hello everyone. I am new here and I would like to start by saying that this site is great! I have some electronics background but I was out of it for a long time (a few years). I have this car amp DHD Powercruiser NTX 2118 1000W . My brother blew it so its a project of mine trying to fix it now. I already replaced three power mosfets that were blown. I have two channels that work fine now 1 and 2. Channels 3,4 are dead. I am looking for a schematic diagram to get a better ideea of what its going on but so far I failed to find a site that can give me that. Anyone please point me in the right direction. I would like a schematic if its possible.
 
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