Predator helios 300 from 2019 CPU temp always high, and now microphone array shows as disconnected

This is not my laptop but a friends, the laptop in question is overheating so it means it needs new thermal paste, but my question is where is the microphone cable ? the microphone stopped working after checking, the device "microphone array" is no longer showing as connected, or plugged in. It seems the cable is not connected correctly, is there a guide or manual where is the microphone cable internally ? I will change the thermal paste and will try to fix the microphone cable but I dont know where to do this. Or has someone had this issue before where the microphone array in device manager shows as unplugged?