Finger Print Sensor not working

Hi,

Recently my One Plus 2 Fingerprint sensor/Home button is not responding. I tried all the solutions given but nothing worked.I took my phone to the service center and they have shown me a part of white colored tape inside the phone turned pink.

They said this happens when phone gets into contact with liquid and this is not going to be considered under warranty.

I don't know when this happened to my phone.I asked the guy if there is any way to get this repaired.He said I need to get the entire screen changed which cost 11000 Indian Rupees.

So can you guys please help me if there is any other way.

Thank You in advance.