Rear touch function on ROG 5s Pro do not work anymore after repair

[vamsikrisna]

I collected my 5s Pro recently from the service centre after the motherboard replacement and observed that the rear touch function exclusive to rog 5 ultimate and 5s pro is not working anymore. The people at service centre have no clue about such functionality. What is the way forward now?
Below picture is the test to check it after entering .12345+= in calculator.

[ASUS_Bot]

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