Emphaser EA 1600D Class D Amp trouble

I received this Amp. The owner drilled some mounting holes, and the chips falls inside. PS damaged, and one side of the Audio Bank.
PS is ok. I removed all mosfets from the damaged Audio bank,exchanged transistor Q13( Driveboard) (SMD Code DK) with a DF, which i just had on hand. The Amplitude looks good, the other side is working well. As soon, as i put the output mosfets in the damaged bank, the output filter starts make hissing noise, and all Amplitudes are gone. The mosfets in the damaged side heat up quickly. Also the Amplitude on the good side is gone or dropping. Maybe somebody has an idea.
 

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