helps to know erased circuits, planet audio RXD1400 amplifier module.

Good afternoon, I request your collaboration and help with this amplifier of the brand planet audio model RXD1400, I repaired the source but when testing the digital output mosfet transistors, I found that the module was not switching, it is a black module covered in epoxy, I was able to dismember it but it turns out that it has the license plates erased, it is only possible to see two integrated, I attach some images.
 
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