SoundMagus PK1400.4

Hello friends... I'm looking for the name of these components in the power supply stage. The amplifier is a SoundMagus PK1400.4. The components appear to be transistors, but I've tried several without getting satisfactory results. Two of them have a number (23), one only shows the letter S, and the last one didn't have a number because it was completely blown. I hope someone has an amplifier in their possession and can guide me. Greetings, friends, and have a good night.
 

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Hello good evening, the longest transistor does not feed the regulator, it is working, I decided to investigate further in front of the regulator since it was getting hot, using a thermal camera I discovered that a programmable Controller is shorted, this is powered by the 5v regulator, I measured continuity between the power pins of the Controller and found the short, I removed it and the regulator no longer heated, I'm afraid I will have to look for a card, I hope to find greetings
 

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Is it worth the effort if you have other amps to work on (make money with)?

The MCUs are programmed to work with specific amps and there is some overlap but unless the source of the MCU guarantees compatibility, there is a risk that you're wasting money on the replacement.