Question about MTX JackHammer JH600 Car Audio Amplifier

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MTX Jackhammer JH600- 4 burnt FETs, cant find replacement FETs.

The FETs have a funky looking F at the top left corner then N527AB and 75339P at the bottom, can anyone point me in the right direction so that I can order new ones and put the right FETs back in the amp? Also I cant really identify which side this part of the amp is, Power or Output? Theres a large heatsink in the middle of the board but the heatsink is cut kind of in half, one half has 4 FETs on it, then the other half has 2 RECs and 4 FETs? I think im on the Power side?

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