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Hi @rabs828, welcome to our forum!
Does the red light come from the light/proximity sensor? On the link you below you can see where this sensor is placed on the device (number 6).
https://support.sonymobile.com/global-en/xperiaxa1/userguide/overview---rd/
If it is this sensor, there is nothing wrong, the red light will show up when the device is adjusting the screen brightness.
I hope that answers your question!