Blown Hifonics Brutus BXI 8000D

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hi, i have a blown Hifonics Brutus BXI 8000D..in one bank was one shorted mosfet (FDA59N30).all other are ok.when i replace it,it will be destroyed immediately when amp is turning on.
so i think the driver board is blown too.on that board,i replaced U1,U18 and U12.but that seames not to be all.i dont know what U13 and U16 are.It was made unrecognizable.
has somebody an idea?
 

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