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I need to design a temperature sensor module with some special functionality. You will see a circuit in the pictures below. I need to synthesise a new module which covers requirements of my customers, so I need to do reverse engineering through these circuits. I circles some components with red lines in the pictures. I need to know what those components are. There are no serial numbers or codes on them. So I need help from experinced PCB designers here. Please take a look and if you can help I will very appreciate it. Thank you all.